msm_fb: display: initialize dmap_comp before wait4dmap

blt_wait flag will be set when both two writeback buffers
are used. In this case, kickoff can not be proceeded until
next dmap_done to release writeback buffer. This patch
initialize dmap_comp before wait4dmap to make sure
wait_for_completion is enforced.

CRs-fixed: 448168
Change-Id: I64f2ad599b18f9d8b346c41a55829c564fcced0b
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp4_overlay_dsi_cmd.c

drivers/video/msm/mdp4_overlay_dsi_cmd.c

@@ -328,9 +328,11 @@ int mdp4_dsi_cmd_pipe_commit(int cndx, int wait)
 	spin_lock_irqsave(&vctrl->spin_lock, flags);
 	if (pipe->ov_blt_addr) {
 		/* Blt */
-		if (vctrl->blt_wait)
+		if (vctrl->blt_wait) {
+			INIT_COMPLETION(vctrl->dmap_comp);
 			need_dmap_wait = 1;
-		else if (vctrl->ov_koff != vctrl->ov_done) {
+		}
+		if (vctrl->ov_koff != vctrl->ov_done) {
 			INIT_COMPLETION(vctrl->ov_comp);
 			need_ov_wait = 1;
 		}