[ALSA] ali5451 - Fix invalid type of codec->irq field

The irq field of struct snd_ali shouldn't be unsigned since it's
uninitialized value is -1.

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