video: Fix memory leak when deleting a video display

The display deletion code would not free the driver data or name if the display index was the last, or only one, in the list.

src/video/SDL_video.c

@@ -677,9 +677,9 @@ void SDL_DelVideoDisplay(int index)
 
     SDL_SendDisplayEvent(&_this->displays[index], SDL_DISPLAYEVENT_DISCONNECTED, 0);
 
+    SDL_free(_this->displays[index].driverdata);
+    SDL_free(_this->displays[index].name);
     if (index < (_this->num_displays - 1)) {
-        SDL_free(_this->displays[index].driverdata);
-        SDL_free(_this->displays[index].name);
         SDL_memmove(&_this->displays[index], &_this->displays[index + 1], (_this->num_displays - index - 1) * sizeof(_this->displays[index]));
     }
     --_this->num_displays;