ASoC: sti-sas: Remove the unneeded result variable

Return the value regmap_write() and sti_sas_init_sas_registers() directly
instead of storing it in another redundant variable.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/20220908010304.342760-1-ye.xingchen@zte.com.cn


Signed-off-by: Mark Brown <broonie@kernel.org>