ALSA: asihpi - Fix potential Oops in snd_asihpi_cmode_info()

Dan Carpenter reported that setting 0 to uinfo->value.enumerated.items
in snd_asihpi_cmode_info() may lead to Oops.  This function should
return an error immediately in such a case instead.

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/asihpi.c

@@ -2259,6 +2259,9 @@ static int snd_asihpi_cmode_info(struct snd_kcontrol *kcontrol,
 			valid_modes++;
 			}
 
+	if (!valid_modes)
+		return -EINVAL;
+
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 	uinfo->count = 1;
 	uinfo->value.enumerated.items = valid_modes;