SDL: Fixed Linux build

SDL Commits
1 
From 18e69827aa91d749a7570a642d75fc9d6a187bc4 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 8 Nov 2021 22:29:02 -0800
Subject: [PATCH] Fixed Linux build

---
 src/video/x11/SDL_x11xfixes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11xfixes.c b/src/video/x11/SDL_x11xfixes.c
index 40850dd69b..3595b017d1 100644
--- a/src/video/x11/SDL_x11xfixes.c
+++ b/src/video/x11/SDL_x11xfixes.c
@@ -76,7 +76,7 @@ X11_XfixesIsInitialized()
 void
 X11_SetWindowMouseRect(_THIS, SDL_Window * window)
 {
-    if (SDL_RectEmpty(window->mouse_rect)) {
+    if (SDL_RectEmpty(&window->mouse_rect)) {
         X11_ConfineCursorWithFlags(_this, window, NULL, 0);
     } else {
         if (window->flags & SDL_WINDOW_INPUT_FOCUS) {