SDL: video: Return an error on failure to set the video mode

SDL Commits
1 
From 8f8746cc1bcb7c681ae0ed9003d85fe7a4790520 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Sun, 22 Jan 2023 15:06:30 -0500
Subject: [PATCH] video: Return an error on failure to set the video mode

If SDL_UpdateFullscreenMode() fails to find a matching mode for the window, it will restore the window to its previous state, but still returns a success code of 0. Return an error code of -1 if no matching display mode can be found.
---
 src/video/SDL_video.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 7f5947618633..c44efc6ceff2 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1324,6 +1324,7 @@ static int SDL_UpdateFullscreenMode(SDL_Window *window, SDL_bool fullscreen)
 {
     SDL_VideoDisplay *display;
     SDL_Window *other;
+    int retval = 0;
 
     CHECK_WINDOW_MAGIC(window, -1);
 
@@ -1468,6 +1469,9 @@ static int SDL_UpdateFullscreenMode(SDL_Window *window, SDL_bool fullscreen)
 
                 window->last_fullscreen_flags = window->flags;
                 return 0;
+            } else {
+                /* Failed to find a matching mode, return an error after restoring windowed mode. */
+                retval = -1;
             }
         }
     }
@@ -1487,7 +1491,7 @@ static int SDL_UpdateFullscreenMode(SDL_Window *window, SDL_bool fullscreen)
     SDL_RestoreMousePosition(window);
 
     window->last_fullscreen_flags = window->flags;
-    return 0;
+    return retval;
 }
 
 #define CREATE_FLAGS \