drm/armada: allow armada_drm_plane_work_queue() to silently fail

Avoid printing an error message when armada_drm_plane_work_queue() is
unable to get the vblank (eg, because we're doing a modeset.)  Continue
to report the failure to the caller, so the caller can handle this.

Move the error message into armada_ovl_plane_update().

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
index 401ad85..2f8e459 100644
--- a/drivers/gpu/drm/armada/armada_crtc.c
+++ b/drivers/gpu/drm/armada/armada_crtc.c
@@ -254,10 +254,8 @@
 	int ret;
 
 	ret = drm_crtc_vblank_get(&dcrtc->crtc);
-	if (ret) {
-		DRM_ERROR("failed to acquire vblank counter\n");
+	if (ret)
 		return ret;
-	}
 
 	ret = cmpxchg(&plane->work, NULL, work) ? -EBUSY : 0;
 	if (ret)