[ Upstream commit 536cc27deade8f1ec3c1beefa60d5fbe0f6fcb28 ]

devm_regmap_init_i2c may fail and return NULL. The fix returns
the error when it fails.
Signed-off-by: NKangjie Lu <kjlu@umn.edu>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>