SDL: Fix 'potentially uninitialized local pointer variable' error in UWP builds

SDL Commits
1 
From 2f7b885df954c130252e1a98b49ea0a7013c1dec Mon Sep 17 00:00:00 2001
From: Cameron Cawley <[EMAIL REDACTED]>
Date: Mon, 28 Feb 2022 16:30:34 +0000
Subject: [PATCH] Fix 'potentially uninitialized local pointer variable' error
 in UWP builds

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

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 9236a06f269..33cde9bccc9 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -2452,7 +2452,7 @@ static SDL_Surface *
 SDL_CreateWindowFramebuffer(SDL_Window * window)
 {
     Uint32 format;
-    void *pixels;
+    void *pixels = NULL;
     int pitch;
     int bpp;
     Uint32 Rmask, Gmask, Bmask, Amask;