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games/doom: don't spawn midi process when opening /dev/audio failed (thanks qwx)

--- a/sys/src/games/doom/i_sound.c

+++ b/sys/src/games/doom/i_sound.c

@@ -450,7 +450,7 @@

 	char name[64];

 	int n;

-	if(M_CheckParm("-nomusic"))

+	if(M_CheckParm("-nomusic") || audio_fd < 0)

 		return;

 	I_ShutdownMusic();

 	if(pipe(mpfd) < 0)