usb: remove dead assignments, spotted by clang analyzer

Value stored is never read.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/usb-bus.c

@@ -152,11 +152,10 @@ static void do_attach(USBDevice *dev)
 int usb_device_attach(USBDevice *dev)
 {
     USBBus *bus = usb_bus_from_device(dev);
-    USBDevice *hub;
 
     if (bus->nfree == 1) {
         /* Create a new hub and chain it on.  */
-        hub = usb_create_simple(bus, "usb-hub");
+        usb_create_simple(bus, "usb-hub");
     }
     do_attach(dev);
     return 0;

hw/usb-hub.c

@@ -366,11 +366,10 @@ static int usb_hub_handle_control(USBDevice *dev, int request, int value,
         {
             unsigned int n = index - 1;
             USBHubPort *port;
-            USBDevice *dev;
+
             if (n >= s->nb_ports)
                 goto fail;
             port = &s->ports[n];
-            dev = port->port.dev;
             switch(value) {
             case PORT_ENABLE:
                 port->wPortStatus &= ~PORT_STAT_ENABLE;

hw/usb-net.c

@@ -972,11 +972,10 @@ static int rndis_keepalive_response(USBNetState *s,
 
 static int rndis_parse(USBNetState *s, uint8_t *data, int length)
 {
-    uint32_t msg_type, msg_length;
+    uint32_t msg_type;
     le32 *tmp = (le32 *) data;
 
-    msg_type = le32_to_cpup(tmp++);
+    msg_type = le32_to_cpup(tmp);
-    msg_length = le32_to_cpup(tmp++);
 
     switch (msg_type) {
     case RNDIS_INITIALIZE_MSG:

hw/usb-ohci.c

@@ -599,7 +599,9 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed,
 {
     int dir;
     size_t len = 0;
+#ifdef DEBUG_ISOCH
     const char *str = NULL;
+#endif
     int pid;
     int ret;
     int i;
@@ -663,15 +665,21 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed,
     dir = OHCI_BM(ed->flags, ED_D);
     switch (dir) {
     case OHCI_TD_DIR_IN:
+#ifdef DEBUG_ISOCH
         str = "in";
+#endif
         pid = USB_TOKEN_IN;
         break;
     case OHCI_TD_DIR_OUT:
+#ifdef DEBUG_ISOCH
         str = "out";
+#endif
         pid = USB_TOKEN_OUT;
         break;
     case OHCI_TD_DIR_SETUP:
+#ifdef DEBUG_ISOCH
         str = "setup";
+#endif
         pid = USB_TOKEN_SETUP;
         break;
     default:
@@ -834,7 +842,9 @@ static int ohci_service_td(OHCIState *ohci, struct ohci_ed *ed)
 {
     int dir;
     size_t len = 0;
+#ifdef DEBUG_PACKET
     const char *str = NULL;
+#endif
     int pid;
     int ret;
     int i;
@@ -871,15 +881,21 @@ static int ohci_service_td(OHCIState *ohci, struct ohci_ed *ed)
 
     switch (dir) {
     case OHCI_TD_DIR_IN:
+#ifdef DEBUG_PACKET
         str = "in";
+#endif
         pid = USB_TOKEN_IN;
         break;
     case OHCI_TD_DIR_OUT:
+#ifdef DEBUG_PACKET
         str = "out";
+#endif
         pid = USB_TOKEN_OUT;
         break;
     case OHCI_TD_DIR_SETUP:
+#ifdef DEBUG_PACKET
         str = "setup";
+#endif
         pid = USB_TOKEN_SETUP;
         break;
     default:

hw/usb-serial.c

@@ -449,7 +449,7 @@ static int usb_serial_handle_data(USBDevice *dev, USBPacket *p)
         /* handle serial break */
         if (s->event_trigger && s->event_trigger & FTDI_BI) {
             s->event_trigger &= ~FTDI_BI;
-            *data++ = FTDI_BI;
+            *data = FTDI_BI;
             ret = 2;
             break;
         } else {

hw/usb-uhci.c

@@ -698,7 +698,6 @@ static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_
 
     if (pid == USB_TOKEN_IN) {
         if (len > max_len) {
-            len = max_len;
             ret = USB_RET_BABBLE;
             goto out;
         }
@@ -865,8 +864,7 @@ static void uhci_async_complete(USBPacket *packet, void *opaque)
         UHCI_TD td;
         uint32_t link = async->td;
         uint32_t int_mask = 0, val;
-        int len;
+
- 
         cpu_physical_memory_read(link & ~0xf, (uint8_t *) &td, sizeof(td));
         le32_to_cpus(&td.link);
         le32_to_cpus(&td.ctrl);
@@ -874,7 +872,7 @@ static void uhci_async_complete(USBPacket *packet, void *opaque)
         le32_to_cpus(&td.buffer);
 
         uhci_async_unlink(s, async);
-        len = uhci_complete_td(s, &td, async, &int_mask);
+        uhci_complete_td(s, &td, async, &int_mask);
         s->pending_int_mask |= int_mask;
 
         /* update the status bits of the TD */

usb-linux.c

@@ -287,7 +287,7 @@ static void async_cancel(USBPacket *unused, void *opaque)
 static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
 {
     int dev_descr_len, config_descr_len;
-    int interface, nb_interfaces, nb_configurations;
+    int interface, nb_interfaces;
     int ret, i;
 
     if (configuration == 0) /* address state - ignore */
@@ -299,7 +299,6 @@ static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
     dev_descr_len = dev->descr[0];
     if (dev_descr_len > dev->descr_len)
         goto fail;
-    nb_configurations = dev->descr[17];
 
     i += dev_descr_len;
     while (i < dev->descr_len) {