drm: omapdrm: Don't get/put dispc in omap_crtc_flush()

The omap_crtc_flush() function is always called with a reference to the
dispc held. Remove unnecessary calls to dispc_runtime_get() and
dispc_runtime_put().
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -368,8 +368,6 @@ static int omap_crtc_flush(struct drm_crtc *crtc)
 	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 	WARN_ON(omap_crtc->vblank_irq.registered);
 
-	dispc_runtime_get();
-
 	if (dispc_mgr_is_enabled(omap_crtc->channel)) {
 		dispc_mgr_go(omap_crtc->channel);
 		omap_irq_register(crtc->dev, &omap_crtc->vblank_irq);
@@ -379,8 +377,6 @@ static int omap_crtc_flush(struct drm_crtc *crtc)
 		reinit_completion(&omap_crtc->completion);
 	}
 
-	dispc_runtime_put();
-
 	return 0;
 }