ASoC: max98373: Add checks for devm_kcalloc

ASoC: max98373: Add checks for devm_kcalloc

[ Upstream commit 60591bbf6d5eb44f275eb733943b7757325c1b60 ]

As the devm_kcalloc may return NULL pointer,
it should be better to check the return value
in order to avoid NULL poineter dereference.

Fixes: 349dd23931d1 ("ASoC: max98373: don't access volatile registers in bias level off")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20221116082508.17418-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>