media: cx88: add error handling for snd_ctl_add

When snd_ctl_add fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling snd_ctl_add.
Signed-off-by: NZhouyang Jia <jiazhouyang09@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/pci/cx88/cx88-alsa.c

@@ -962,8 +962,11 @@ static int cx88_audio_initdev(struct pci_dev *pci,
 		goto error;
 
 	/* If there's a wm8775 then add a Line-In ALC switch */
-	if (core->sd_wm8775)
-		snd_ctl_add(card, snd_ctl_new1(&snd_cx88_alc_switch, chip));
+	if (core->sd_wm8775) {
+		err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_alc_switch, chip));
+		if (err < 0)
+			goto error;
+	}
 
 	strcpy(card->driver, "CX88x");
 	sprintf(card->shortname, "Conexant CX%x", pci->device);