mdss: dsi: Fix null dereferences

Fix potential null dereferences in driver.

Change-Id: Idd8d4eb16bb1b9562da1f5225d91cf90d8230bfe
Signed-off-by: Charles Bin <cbin@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>
1 file changed