of: check for IS_ERR()
get_phy_device() can return an ERR_PTR() Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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get_phy_device() can return an ERR_PTR() Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>