broadcom: b44: Use b44_writephy() return value
Return result of b44_writephy() instead of zero to deal with possible error. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by:Artem Chernyshev <artem.chernyshev@red-soft.ru> Reviewed-by:
Leon Romanovsky <leonro@nvidia.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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