When searching for PHYs, any error was treated as if the PHY did not
exist or was not specified. Thus the probe function did not
correctly return error conditions such as -EPROBE_DEFER.

Fixed so that only a non-existing PHY is ignored and any other error
is returned.
Acked-by: NEric Anholt <eric@anholt.net>
Reported-by: NAlexander Aring <alex.aring@gmail.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Tested-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>