Win32: only check joypads on arrival/disconnect

win32/wsnes9x.cpp

@@ -197,6 +197,7 @@
 #include <objidl.h>
 #include <shlwapi.h>
 #include <Shobjidl.h>
+#include <dbt.h>
 
 #include "wsnes9x.h"
 #include "win32_sound.h"
@@ -2671,6 +2672,7 @@ LRESULT CALLBACK WinProc(
 		break;
 #endif
     case WM_DEVICECHANGE:
+        if(wParam == DBT_DEVICEARRIVAL || wParam == DBT_DEVICEREMOVECOMPLETE)
             S9xDetectJoypads();
         break;
     }