drivers: tegra: imx091/max77665: fix edp issue

Fix the potential NULL pointer usage in the case there is no edp client
allocated.

bug 1193275

Change-Id: I901920b65ca9ffef0d859c2746106ad7ffdbcf10
Signed-off-by: Charlie Huang <chahuang@nvidia.com>
Reviewed-on: http://git-master/r/170249
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
2 files changed