greybus: arche-apb: NULL is a valid regulator
Since NULL could in theory be a valid regulator we ought to check for IS_ERR() rather than for NULL. In practice this is unlikely to be an issue but it's better for neatness. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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