The 'map_failed' label will return 'ret', so we need to assign the error
code to 'ret', otherwise the probe function will return success.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NHuang Shijie <shijie8@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>