[ALSA] missing error check in usb sound driver

usb_set_interface() can fail, even for altsetting 0

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
1 file changed