SDL: dummyvideo: Change a thing returning a 0 pointer to return NULL instead.

SDL Commits
1 
From bc1ceb0883cc7dc973b42a852927395d9f1432a2 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 16 Jul 2024 14:17:02 -0400
Subject: [PATCH] dummyvideo: Change a thing returning a 0 pointer to return
 NULL instead.

---
 src/video/dummy/SDL_nullvideo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/dummy/SDL_nullvideo.c b/src/video/dummy/SDL_nullvideo.c
index e4f8efa902701..a001433b5542e 100644
--- a/src/video/dummy/SDL_nullvideo.c
+++ b/src/video/dummy/SDL_nullvideo.c
@@ -89,13 +89,13 @@ static SDL_VideoDevice *DUMMY_InternalCreateDevice(const char *enable_hint)
     SDL_VideoDevice *device;
 
     if (!DUMMY_Available(enable_hint)) {
-        return 0;
+        return NULL;
     }
 
     /* Initialize all variables that we clean on shutdown */
     device = (SDL_VideoDevice *)SDL_calloc(1, sizeof(SDL_VideoDevice));
     if (!device) {
-        return 0;
+        return NULL;
     }
     device->is_dummy = SDL_TRUE;