net: ethernet: microchip: lan743x: Fix driver crash when lan743x_pm_resume fails

The driver needs to clean up and return when the initialization fails on resume.

Fixes: 23f0703c

 ("lan743x: Add main source files for new lan743x driver")
Signed-off-by: Yuiko Oshino <yuiko.oshino@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>