regulator: s2mpa01: Fix inconsistent indenting

Broken indenting makes code more difficult to read and brings
confusion. Fix warning reported by Smatch:
	s2mpa01.c:362 s2mpa01_pmic_probe() warn: inconsistent indenting
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>