phy: cadence: Sierra: Fix error return code in cdns_sierra_phy_probe()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: a43f72ae ("phy: cadence: Sierra: Change MAX_LANES of Sierra to 16")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Link: https://lore.kernel.org/r/20210517015749.127799-1-wangwensheng4@huawei.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>