drm/msm/sde: Fix clang compilation in SDE driver

Make change to ensure SDE driver compiles fine
with clang enabled.

Change-Id: I83cb2fef2b0ff8a4cdd1d77b180ebea4fef1b629
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
1 file changed