linux-imx

ASoC: sti-sas: Fix checking return value for ERR_PTR

Both devm_regmap_init and syscon_regmap_lookup_by_phandle return ERR_PTR
on failure.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>