The original fix by Julien Brunel <brunel@diku.dk>.

aaci_init_card() returns a pointer with ERR_PTR(), but in aaci_init()
NULL is supposed at this error path.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>