[ALSA] dbri: driver cleanup

This patch fixes white spaces, spelling and formatting
to conform closer to the coding standard of the kernel.
It contains few fixes pointed out by the checkpatch.pl script.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>