Only attempt a graceful shutdown when there's a STM hook

For Wii graceful shutdown to work, the emulated software has to open
the STM event hook and install a hook. Without this, there is no way
to inform them about the shutdown, so trying to do a graceful shutdown
and requiring the use of the shutdown fallback (exiting a second time
to force) is pointless.

Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_stm.cpp

@@ -135,6 +135,11 @@ IPCCommandResult CWII_IPC_HLE_Device_stm_eventhook::IOCtl(u32 command_address)
   return GetNoReply();
 }
 
+bool CWII_IPC_HLE_Device_stm_eventhook::HasHookInstalled() const
+{
+  return s_event_hook_address != 0;
+}
+
 void CWII_IPC_HLE_Device_stm_eventhook::TriggerEvent(const u32 event) const
 {
   if (!m_Active || s_event_hook_address == 0)

Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_stm.h

@@ -59,6 +59,7 @@ public:
   IPCCommandResult Close(u32 command_address, bool force) override;
   IPCCommandResult IOCtl(u32 command_address) override;
 
+  bool HasHookInstalled() const;
   void ResetButton() const;
   void PowerButton() const;
 

Source/Core/DolphinWX/FrameTools.cpp

@@ -42,6 +42,8 @@
 #include "Core/HW/Wiimote.h"
 #include "Core/Host.h"
 #include "Core/HotkeyManager.h"
+#include "Core/IPC_HLE/WII_IPC_HLE.h"
+#include "Core/IPC_HLE/WII_IPC_HLE_Device_stm.h"
 #include "Core/IPC_HLE/WII_IPC_HLE_Device_usb_bt_emu.h"
 #include "Core/IPC_HLE/WII_IPC_HLE_WiiMote.h"
 #include "Core/Movie.h"
@@ -1341,7 +1343,9 @@ void CFrame::DoStop()
       }
     }
 
-    if (SConfig::GetInstance().bWii && !m_tried_graceful_shutdown)
+    const auto& stm = WII_IPC_HLE_Interface::GetDeviceByName("/dev/stm/eventhook");
+    if (!m_tried_graceful_shutdown && stm &&
+        std::static_pointer_cast<CWII_IPC_HLE_Device_stm_eventhook>(stm)->HasHookInstalled())
     {
       Core::DisplayMessage("Shutting down", 30000);
       // Unpause because gracefully shutting down needs the game to actually request a shutdown

Source/Core/DolphinWX/MainNoGUI.cpp

@@ -23,6 +23,8 @@
 #include "Core/Core.h"
 #include "Core/HW/Wiimote.h"
 #include "Core/Host.h"
+#include "Core/IPC_HLE/WII_IPC_HLE.h"
+#include "Core/IPC_HLE/WII_IPC_HLE_Device_stm.h"
 #include "Core/IPC_HLE/WII_IPC_HLE_Device_usb_bt_emu.h"
 #include "Core/IPC_HLE/WII_IPC_HLE_WiiMote.h"
 #include "Core/State.h"
@@ -232,7 +234,9 @@ class PlatformX11 : public Platform
     {
       if (s_shutdown_requested.TestAndClear())
       {
-        if (!s_tried_graceful_shutdown.IsSet() && SConfig::GetInstance().bWii)
+        const auto& stm = WII_IPC_HLE_Interface::GetDeviceByName("/dev/stm/eventhook");
+        if (!s_tried_graceful_shutdown.IsSet() && stm &&
+            std::static_pointer_cast<CWII_IPC_HLE_Device_stm_eventhook>(stm)->HasHookInstalled())
         {
           ProcessorInterface::PowerButton_Tap();
           s_tried_graceful_shutdown.Set();