SDL_mixer: timidity/readmidi.c (getvl): fix incorrect SDL3 conversion of SDL_RWread

SDL Commits
1 
From 89c66521721770abec3581107fb460fcf9f8c0d9 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 23 Jan 2023 20:03:10 +0300
Subject: [PATCH] timidity/readmidi.c (getvl): fix incorrect SDL3 conversion of
 SDL_RWread

---
 src/codecs/timidity/readmidi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/codecs/timidity/readmidi.c b/src/codecs/timidity/readmidi.c
index 29358ada..3d7ac2f3 100644
--- a/src/codecs/timidity/readmidi.c
+++ b/src/codecs/timidity/readmidi.c
@@ -37,7 +37,7 @@ static Sint32 getvl(SDL_RWops *rw)
   Uint8 c;
   for (;;)
     {
-      if (SDL_RWread(rw, &c, 1) != 0) return l;
+      if (SDL_RWread(rw, &c, 1) != 1) return l;
       l += (c & 0x7f);
       if (!(c & 0x80)) return l;
       l<<=7;