drm/omapdrm: Fix omap_atomic_wait_for_completion

Use the new iterator macro and look for crtc_state->active instead of
enable, only crtc_state->active implies that vblanks will happen.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20170719143920.25685-5-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -57,13 +57,13 @@ static void omap_fb_output_poll_changed(struct drm_device *dev)
 static void omap_atomic_wait_for_completion(struct drm_device *dev,
 					    struct drm_atomic_state *old_state)
 {
-	struct drm_crtc_state *old_crtc_state;
+	struct drm_crtc_state *new_crtc_state;
 	struct drm_crtc *crtc;
 	unsigned int i;
 	int ret;
 
-	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
-		if (!crtc->state->enable)
+	for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
+		if (!new_crtc_state->active)
 			continue;
 
 		ret = omap_crtc_wait_pending(crtc);