mdss: display: return proper value at wfd wait4comp

Return 0 at wait4comp to indicate there is no timeout happen.
Otherwise return non 0 to indicate error.

Change-Id: Id801dc49df530830ab691e6b1746741236760d10
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
1 file changed