media: i2c: hi846: check return value of regulator_bulk_disable()

regulator_bulk_disable can fail and thus suspend() can. Handle that error
gracefully.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>