regulator_enable() is marked as as __must_check.  Therefore the return
value of regulator_enable() should be checked.  Also, this patch checks
return value of regulator_set_voltage().
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>