ALSA: ice1712.c: fix coding style

before:
total: 113 errors, 169 warnings, 2786 lines checked
total: 26 errors, 24 warnings, 504 lines checked

after:
total: 14 errors, 163 warnings, 2799 lines checked
total: 0 errors, 24 warnings, 504 lines checked

Compile tested only.

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>