phy: error handling for platform_device_register_simple()
platform_device_register_simple() returns ERR_PTR() and not NULL. Found by smatch (http://repo.or.cz/w/smatch.git). Compile tested. Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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