phy: tegra: xusb: Add error pointer check in xusb.c

Add error pointer check after tegra_xusb_find_lane().

Fixes: e8f7d2f4 ("phy: tegra: xusb: Add usb-phy support")
Signed-off-by: Dipendra Khadka <kdipendra88@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20240930191101.13184-1-kdipendra88@gmail.com


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