ALSA: opti9xx: fix missing { } around an if block

Currently the { } braces are missing around an if block causing subsequent
code after the return to become unreachable. Fix this by adding the
missing { }.

Addresses-Coverity: ("Structurally dead code")
Fixes: 2973ee4a ("ALSA: opti9xx: Allocate resources with device-managed APIs")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210720153741.73230-1-colin.king@canonical.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/opti9xx/opti92x-ad1848.c

@@ -1096,9 +1096,10 @@ static int snd_opti9xx_pnp_probe(struct pnp_card_link *pcard,
 	if (error)
 		return error;
 	error = snd_opti9xx_read_check(card, chip);
-	if (error)
+	if (error) {
 		snd_printk(KERN_ERR "OPTI chip not found\n");
 		return error;
+	}
 	error = snd_opti9xx_probe(card);
 	if (error < 0)
 		return error;