Roel Kluin 1fda39e6fd OMAP2/3 powerdomain: return errors rather than returning the output of IS_ERR()
IS_ERR returns only 1 or 0, and the functions return a negative error
in other cases anyways.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
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