ALSA: oxygen: change || to &&

In the original code the condition was always true (hopefully) because
WM8776_HPLVOL is zero.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>