SDL_mixer: Compilation fix for OS X/PowerPC

From 49a0a643c73e2d949a1c5ff2c7cfd71a2ec6662c Mon Sep 17 00:00:00 2001
From: Jason Pepas <[EMAIL REDACTED]>
Date: Sat, 9 Apr 2022 22:11:22 -0500
Subject: [PATCH] Compilation fix for OS X/PowerPC

---
 native_midi/native_midi_macosx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/native_midi/native_midi_macosx.c b/native_midi/native_midi_macosx.c
index f0017e21..8970c108 100644
--- a/native_midi/native_midi_macosx.c
+++ b/native_midi/native_midi_macosx.c
@@ -201,7 +201,7 @@ NativeMidiSong *native_midi_loadsong_RW(SDL_RWops *rw, int freerw)
      * So, we use MusicSequenceLoadSMFData() for powerpc versions
      * but the *WithFlags() on intel which require 10.4 anyway. */
     # if defined(__ppc__) || defined(__POWERPC__)
-    if (MusicSequenceLoadSMFData(song->sequence, data) != noErr)
+    if (MusicSequenceLoadSMFData(retval->sequence, data) != noErr)
         goto fail;
     # else
     if (MusicSequenceLoadSMFDataWithFlags(retval->sequence, data, 0) != noErr)