ath6kl: unbreak suspend

Add missing {}'s that caused ath6kl_sdio_suspend to always return -EINVAL
causing suspend to be aborted.

kvalo: I broke this in commit f7325b85 ("ath6kl: add sdio debug messages")

Signed-off-by: Sam Leffler <sleffler@chromium.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>