[ALSA] at73c213: fix error checking for clk API

The clk_round_rate() and clk_set_rate() will return int, so not store thier
return value to unsigned long variable.  This bug hides real error on these
API.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/spi/at73c213.c

@@ -133,7 +133,8 @@ static struct snd_pcm_hardware snd_at73c213_playback_hw = {
 static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
 {
 	unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
-	unsigned long dac_rate_new, ssc_div, status;
+	unsigned long dac_rate_new, ssc_div;
+	int status;
 	unsigned long ssc_div_max, ssc_div_min;
 	int max_tries;