SDL_mixer: eliminate warning

SDL Commits
1 
From 95e82737e02ebaf1a223cc5e6845b44dcdcd444b Mon Sep 17 00:00:00 2001
From: pionere <[EMAIL REDACTED]>
Date: Wed, 15 Dec 2021 11:15:53 +0100
Subject: [PATCH] eliminate warning

---
 src/codecs/music_wav.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/codecs/music_wav.c b/src/codecs/music_wav.c
index e155d7fe..da7ca1e5 100644
--- a/src/codecs/music_wav.c
+++ b/src/codecs/music_wav.c
@@ -640,7 +640,6 @@ static SDL_bool ParseFMT(WAV_Music *wave, Uint32 chunk_length)
 {
     SDL_AudioSpec *spec = &wave->spec;
     _WaveFMT fmt;
-    Uint8 *data;
     int bits;
 
     if (chunk_length < sizeof(fmt.format)) {