power: supply: ltc3651-charger: fix some error codes in probe

There are several cut and past bugs here.  ltc3651_charger->charger is
NULL at this point, so we return success instead of the intended error
codes.

Fixes: c94d4ed0 ("power: supply: Add ltc3651-charger driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[Wei Yongjun found the same issue independently]
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Sebastian Reichel <sre@kernel.org>