media: platform: ti: Add missing check for devm_regulator_get

media: platform: ti: Add missing check for devm_regulator_get

BugLink: https://bugs.launchpad.net/bugs/2011425
[ Upstream commit da8e05f84a11c3cc3b0ba0a3c62d20e358002d99 ]

Add check for the return value of devm_regulator_get since it may return
error pointer.

Fixes: 448de7e7850b ("[media] omap3isp: OMAP3 ISP core")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>