Merge pull request #447 from thaJeztah/19.03_backport_fix_containerStart_unhandled_error

[19.03 backport] daemon:containerStart() fix unhandled error for saveApparmorConfig

daemon/start.go

@@ -161,7 +161,7 @@ func (daemon *Daemon) containerStart(container *container.Container, checkpoint
 		container.HasBeenManuallyStopped = false
 	}
 
-	if daemon.saveApparmorConfig(container); err != nil {
+	if err := daemon.saveApparmorConfig(container); err != nil {
 		return err
 	}