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

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: 2973ee4a5b54 ("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.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>