iio: hmc5843: fix potential NULL pointer dereferences

commit 536cc27d upstream.

devm_regmap_init_i2c may fail and return NULL. The fix returns
the error when it fails.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>