wayland: Avoid infinite loop in keyboard_repeat_handle

If `repeat_info->next_repeat_ms` overflows, many key presses will be generated.
In the worst case, `now = 0xFFFFFFFFU` and the loop will never terminate.

Rearrange the comparison in order to gracefully handle the overflow case.

Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>

src/video/wayland/SDL_waylandevents.c

@@ -210,7 +210,7 @@ keyboard_repeat_handle(SDL_WaylandKeyboardRepeat* repeat_info, uint32_t now)
     if (!repeat_info->is_key_down || !repeat_info->is_initialized) {
         return ret;
     }
-    while (repeat_info->next_repeat_ms <= now) {
+    while ((now - repeat_info->next_repeat_ms) < 0x80000000U) {
         if (repeat_info->scancode != SDL_SCANCODE_UNKNOWN) {
             SDL_SendKeyboardKey(SDL_PRESSED, repeat_info->scancode);
         }