ALSA: ice1712: remove unneeded return statement

the functions:
        snd_ice1712_akm4xxx_build_controls
        snd_ice1712_build_pro_mixer
        snd_ctl_add
        snd_ak4114_build
        prodigy192_ak4114_init
        snd_ak4113_build
are all returning either 0 or a negetive error value.
so we can easily remove the check for a negative value and return
the value instead.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
index 48a0c33..5975334 100644
--- a/sound/pci/ice1712/ice1712.c
+++ b/sound/pci/ice1712/ice1712.c
@@ -1295,10 +1295,7 @@
 			return err;
 	}
 
-	err = snd_ice1712_build_pro_mixer(ice);
-	if (err < 0)
-		return err;
-	return 0;
+	return snd_ice1712_build_pro_mixer(ice);
 }
 
 /*
@@ -1545,10 +1542,9 @@
 			dev_warn(ice->card->dev,
 				 "cannot initialize ac97 for consumer, skipped\n");
 		else {
-			err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97, ice));
-			if (err < 0)
-				return err;
-			return 0;
+			return snd_ctl_add(ice->card,
+			snd_ctl_new1(&snd_ice1712_mixer_digmix_route_ac97,
+				     ice));
 		}
 	}
 
@@ -2497,11 +2493,8 @@
 	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_volume_rate, ice));
 	if (err < 0)
 		return err;
-	err = snd_ctl_add(ice->card, snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
-	if (err < 0)
-		return err;
-
-	return 0;
+	return snd_ctl_add(ice->card,
+			   snd_ctl_new1(&snd_ice1712_mixer_pro_peak, ice));
 }
 
 static int snd_ice1712_free(struct snd_ice1712 *ice)