Added a cleanup function for virtual joysticks

include/SDL3/SDL_joystick.h

@@ -451,6 +451,7 @@ typedef struct SDL_VirtualJoystickDesc
     SDL_bool (SDLCALL *SetLED)(void *userdata, Uint8 red, Uint8 green, Uint8 blue); /**< Implements SDL_SetJoystickLED() */
     SDL_bool (SDLCALL *SendEffect)(void *userdata, const void *data, int size); /**< Implements SDL_SendJoystickEffect() */
     SDL_bool (SDLCALL *SetSensorsEnabled)(void *userdata, SDL_bool enabled); /**< Implements SDL_SetGamepadSensorEnabled() */
+    void (SDLCALL *Cleanup)(void *userdata); /**< Cleans up the userdata when the joystick is detached */
 } SDL_VirtualJoystickDesc;
 
 /**

src/joystick/virtual/SDL_virtualjoystick.c

@@ -70,6 +70,10 @@ static void VIRTUAL_FreeHWData(joystick_hwdata *hwdata)
         return;
     }
 
+    if (hwdata->desc.Cleanup) {
+        hwdata->desc.Cleanup(hwdata->desc.userdata);
+    }
+
     // Remove hwdata from SDL-global list
     for (cur = g_VJoys; cur; prev = cur, cur = cur->next) {
         if (hwdata == cur) {