Fix "use as headset mic, without its own jack detect" problem.

[ Minor coding style fixes by tiwai ]
Signed-off-by: PeiSen Hou <pshou@realtek.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/481963e4a5694ff19f27ae1e283d79ad@realtek.comSigned-off-by: Takashi Iwai <tiwai@suse.de>