SDL_mixer: Make mixer optional in MIX_LoadRawAudio_IO

SDL Commits
1 
From 782851f696aef22d316ca04c1181f9b04e9f4454 Mon Sep 17 00:00:00 2001
From: Alexander Batalov <[EMAIL REDACTED]>
Date: Tue, 29 Jul 2025 22:51:52 +0300
Subject: [PATCH] Make mixer optional in MIX_LoadRawAudio_IO

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

diff --git a/src/SDL_mixer.c b/src/SDL_mixer.c
index 935e05c1..67837468 100644
--- a/src/SDL_mixer.c
+++ b/src/SDL_mixer.c
@@ -1168,7 +1168,7 @@ MIX_Audio *MIX_LoadAudio(MIX_Mixer *mixer, const char *path, bool predecode)
 
 MIX_Audio *MIX_LoadRawAudio_IO(MIX_Mixer *mixer, SDL_IOStream *io, const SDL_AudioSpec *spec, bool closeio)
 {
-    if (!CheckMixerParam(mixer)) {
+    if (!CheckInitialized()) {
         if (io && closeio) { SDL_CloseIO(io); }
         return NULL;
     } else if (!io) {