usb: Fix a few more warnings.

pcsx2/USB/usb-eyetoy/cam-windows.cpp

@@ -471,7 +471,7 @@ namespace usb_eyetoy
 		{
 			mpeg_mutex.lock();
 			int len2 = mpeg_buffer.length;
-			if (len < mpeg_buffer.length)
+			if ((unsigned int)len < mpeg_buffer.length)
 				len2 = len;
 			memcpy(buf, mpeg_buffer.start, len2);
 			mpeg_buffer.length = 0;

pcsx2/USB/usb-eyetoy/cam-windows.h

@@ -72,11 +72,11 @@ namespace usb_eyetoy
 
 		typedef void (*DShowVideoCaptureCallback)(unsigned char* data, int len, int bitsperpixel);
 
-		typedef struct
+		struct buffer_t
 		{
 			void* start = NULL;
 			size_t length = 0;
-		} buffer_t;
+		};
 
 		static const char* APINAME = "DirectShow";
 

pcsx2/USB/usb-eyetoy/usb-eyetoy-webcam.cpp

@@ -456,8 +456,6 @@ namespace usb_eyetoy
 						memcpy(data, footer, sizeof(footer));
 						s->frame_step = 0;
 					}
-
-				send_packet:
 					usb_packet_copy(p, data, max_ep_size);
 				}
 				else if (devep == 2)