sound: Remove unnecessary semicolon

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r1@
statement S;
position p,p1;
@@
S@p1;@p

@script:python r2@
p << r1.p;
p1 << r1.p1;
@@
if p[0].line != p1[0].line_end:
        cocci.include_match(False)
@@
position r1.p;
@@
-;@p
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/mixart/mixart_hwdep.c

@@ -538,7 +538,7 @@ static int mixart_dsp_load(struct mixart_mgr* mgr, int index, const struct firmw
 
 		if ((err = snd_card_register(chip->card)) < 0)
 			return err;
-	};
+	}
 
 	snd_printdd("miXart firmware downloaded and successfully set up\n");