ALSA: ice1712: consider error value

earlier we were ignoring the return value of snd_ak4114_create and
always returning 0.
now we are returning the actual status. revo_init is calling this
function, and revo_init is checking the return value.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>