sdl12-compat: fix a stupid watcom warning.

SDL Commits
1 
From bf366a12463dd468b0a7c1dc6d0c1c7dec1c08e2 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 7 Jun 2021 23:55:50 +0300
Subject: [PATCH] fix a stupid watcom warning.

---
 src/dr_mp3.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/dr_mp3.h b/src/dr_mp3.h
index ff673fd..c280a56 100644
--- a/src/dr_mp3.h
+++ b/src/dr_mp3.h
@@ -4192,7 +4192,7 @@ static float* drmp3__full_read_and_close_f32(drmp3* pMP3, drmp3_config* pConfig,
 
             oldFramesBufferSize = framesCapacity * pMP3->channels * sizeof(float);
             newFramesBufferSize = newFramesCap   * pMP3->channels * sizeof(float);
-            if (newFramesBufferSize > DRMP3_SIZE_MAX) {
+            if (newFramesBufferSize > (drmp3_uint64)DRMP3_SIZE_MAX) {
                 break;
             }
 
@@ -4260,7 +4260,7 @@ static drmp3_int16* drmp3__full_read_and_close_s16(drmp3* pMP3, drmp3_config* pC
 
             oldFramesBufferSize = framesCapacity * pMP3->channels * sizeof(drmp3_int16);
             newFramesBufferSize = newFramesCap   * pMP3->channels * sizeof(drmp3_int16);
-            if (newFramesBufferSize > DRMP3_SIZE_MAX) {
+            if (newFramesBufferSize > (drmp3_uint64)DRMP3_SIZE_MAX) {
                 break;
             }