SDL_image: avif: fix -Wsign-compare warning (a9c5b)

SDL Commits
1 
From a9c5b86f4cdc8ad4194a2cb8adf5c343355cfd30 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Sun, 18 Jun 2023 10:45:29 +0200
Subject: [PATCH] avif: fix -Wsign-compare warning

Co-authored-by: Ozkan Sezer <sezeroz@gmail.com>
---
 src/IMG_avif.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/IMG_avif.c b/src/IMG_avif.c
index 4f51282b..e5873307 100644
--- a/src/IMG_avif.c
+++ b/src/IMG_avif.c
@@ -199,13 +199,13 @@ static avifResult ReadAVIFIO(struct avifIO * io, uint32_t readFlags, uint64_t of
         return AVIF_RESULT_IO_ERROR;
     }
 
-    if (size > context->size) {
+    if (size > (Uint64)context->size) {
         uint8_t *data = (uint8_t *)SDL_realloc(context->data, size);
         if (!data) {
             return AVIF_RESULT_IO_ERROR;
         }
         context->data = data;
-        context->size = size;
+        context->size = (Sint64)size;
     }
 
     out->data = context->data;