SDL_video.c: fix variable 'i' may be uninitialized when used here "_this->name = bootstrap[i]->name;"

src/video/SDL_video.c

@@ -413,7 +413,7 @@ SDL_VideoInit(const char *driver_name)
     SDL_bool init_keyboard = SDL_FALSE;
     SDL_bool init_mouse = SDL_FALSE;
     SDL_bool init_touch = SDL_FALSE;
-    int i;
+    int i = 0;
 
     /* Check to make sure we don't overwrite '_this' */
     if (_this != NULL) {