ALSA: arm: Remove unnecessary variables

There is no need to define the variable "ret" to receive.

Signed-off-by: zuoqilin <zuoqilin@yulong.com>
Link: https://lore.kernel.org/r/20210610024053.1217-1-zuoqilin1@163.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>