Revert unneeded change

src/audio.c

@@ -839,13 +839,7 @@ void SetMusicPitch(Music music, float pitch)
 {
     alSourcef(music->stream.source, AL_PITCH, pitch);
 }
-/*
-// Set music speed
-void SetMusicSpeed(Music music, float pitch)
-{
-    alSourcef(music->stream.source, AL_PITCH, 0.5f);
-}
-*/
+
 // Get music time length (in seconds)
 float GetMusicTimeLength(Music music)
 {