regulator: Fix _regulator_get_voltage if get_voltage callback is NULL
In the case of get_voltage callback is NULL, current implementation in _regulator_get_voltage will return -EINVAL. Also returns proper error if ret is negative value. Signed-off-by: NAxel Lin <axel.lin@gmail.com> Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>
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