[ALSA] sound: Change final two instances of kcalloc(1,...) to kzalloc()

  Change the two remaining instances in the tree of kcalloc(1,...) to
the corresponding kzalloc() call.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>