OMAPDSS: APPLY: simplify dss_mgr_enable

dss_mgr_enable() has some extra assigns to mp->enabled, which can be
removed.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/apply.c

@@ -1025,16 +1025,14 @@ int dss_mgr_enable(struct omap_overlay_manager *mgr)
 	spin_lock_irqsave(&data_lock, flags);
 
 	mp->enabled = true;
+
 	r = dss_check_settings(mgr, mgr->device);
-	mp->enabled = false;
 	if (r) {
 		DSSERR("failed to enable manager %d: check_settings failed\n",
 				mgr->id);
 		goto err;
 	}
 
-	mp->enabled = true;
-
 	dss_mgr_setup_fifos(mgr);
 
 	dss_write_regs();
@@ -1054,6 +1052,7 @@ int dss_mgr_enable(struct omap_overlay_manager *mgr)
 	return 0;
 
 err:
+	mp->enabled = false;
 	spin_unlock_irqrestore(&data_lock, flags);
 	mutex_unlock(&apply_lock);
 	return r;