sdl12-compat: fix -Wsign-compare warnings. (2d9af)

SDL Commits
1 
From 2d9afcbb9b4f4e616ebc715d7515fd8433c9074a Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 14 Sep 2023 17:00:10 +0300
Subject: [PATCH] fix -Wsign-compare warnings.

---
 src/SDL12_compat.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index f3ecd3bf5..f089a6908 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -2046,7 +2046,7 @@ SDL_JoystickOpened(int device_index)
 }
 
 static SDL_PixelFormatEnum
-BPPToPixelFormat(int bpp)
+BPPToPixelFormat(unsigned bpp)
 {
     #if !SDL_VERSION_ATLEAST(2,0,14)
     #define SDL_PIXELFORMAT_XRGB8888 SDL_PIXELFORMAT_RGB888
@@ -2244,7 +2244,7 @@ Init12VidModes(void)
 {
     const int total = SDL20_GetNumDisplayModes(VideoDisplayIndex);
     const char *maxmodestr;
-    const int max_bpp = SDL12Compat_GetHintInt("SDL12COMPAT_MAX_BPP", 32);
+    const unsigned max_bpp = SDL12Compat_GetHintInt("SDL12COMPAT_MAX_BPP", 32);
     VideoModeList *vmode = NULL;
     void *ptr = NULL;
     int i, j;
@@ -2413,7 +2413,7 @@ Init12Video(void)
 {
     const char *driver = SDL20_GetCurrentVideoDriver();
     const char *scale_method_env = SDL12Compat_GetHint("SDL12COMPAT_SCALE_METHOD");
-    const int max_bpp = SDL12Compat_GetHintInt("SDL12COMPAT_MAX_BPP", 32);
+    const unsigned max_bpp = SDL12Compat_GetHintInt("SDL12COMPAT_MAX_BPP", 32);
     SDL_DisplayMode mode;
     int i;