ALSA: hda/realtek - Fix a typo

A comma was used instead of a semicolon, which may lead to a build
error.

Fixes: cffd3966 ('ALSA: hda/realtek - Fix the regression by widget power-saving')
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>