SDL-1.2: video, os2grop: store chMask as unsigned char

SDL Commits
1 
From f1caf90987baf134acdfa6fc29d0b684b00c4989 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 17 Dec 2021 11:23:04 +0300
Subject: [PATCH] video, os2grop: store chMask as unsigned char

---
 src/video/os2grop/SDL_os2grop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/os2grop/SDL_os2grop.c b/src/video/os2grop/SDL_os2grop.c
index 480ed14f5..7773d0269 100644
--- a/src/video/os2grop/SDL_os2grop.c
+++ b/src/video/os2grop/SDL_os2grop.c
@@ -756,7 +756,7 @@ static void os2_SetIcon(SDL_VideoDevice *pDevice, SDL_Surface *pSDLSurfaceIcon,
   PULONG            pulBitmap;
   SDL_Rect          sSDLRect;
   ULONG             ulX, ulY;
-  CHAR              chMask;
+  UCHAR             chMask;
   PULONG            pulDst, pulSrc, pulDstMask;
 
   /* Remove previous window's icon */