disp: msm: fix kw issues in sde driver

This change addresses out of range and null checks in
sde driver.

Change-Id: I905d795edf6715aa990dd7bbaf061734e95ddea6
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>

msm/sde/sde_rm.c

@@ -1808,7 +1808,7 @@ static int _sde_rm_get_hw_blk_for_cont_splash(struct sde_rm *rm,
 	}
 
 	while (_sde_rm_get_hw_locked(rm, &iter_dsc)) {
-		if (!ctl->ops.read_active_status &&
+		if (ctl->ops.read_active_status &&
 				!(ctl->ops.read_active_status(ctl,
 					SDE_HW_BLK_DSC,
 					iter_dsc.blk->id)))