SDL: Fixed compiler warning on Visual Studio

SDL Commits
1 
From 268fbcd4602a4d238b7e7d565785c56859e14373 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 17 Jun 2021 11:23:47 -0700
Subject: [PATCH] Fixed compiler warning on Visual Studio

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

diff --git a/src/video/SDL_bmp.c b/src/video/SDL_bmp.c
index ecf31aff4..ed6cf2e47 100644
--- a/src/video/SDL_bmp.c
+++ b/src/video/SDL_bmp.c
@@ -411,9 +411,9 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)
             biClrUsed = 1 << biBitCount;
         }
 
-        if (biClrUsed > palette->ncolors) {
+        if (biClrUsed > (Uint32)palette->ncolors) {
             biClrUsed = 1 << biBitCount;  /* try forcing it? */
-            if (biClrUsed > palette->ncolors) {
+            if (biClrUsed > (Uint32)palette->ncolors) {
                 SDL_SetError("Unsupported or incorrect biClrUsed field");
                 was_error = SDL_TRUE;
                 goto done;