Initializing the chips may return with an error, but this error gets
dropped in probe(). Propagate this further to the driver core. Also,
simplify returning the error in one of the init functions.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>