ALSA: usb-audio: remove redundant check on err

The check on err is redundant as both the true and false paths
end up on a break statement. Remove the redundant check.

Detected by CoverityScan, CID#1268773 ("Identical code for different
branches")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/mixer_quirks.c

@@ -1849,8 +1849,6 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 	/* EMU0204 */
 	case USB_ID(0x041e, 0x3f19):
 		err = snd_emu0204_controls_create(mixer);
-		if (err < 0)
-			break;
 		break;
 
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */