linting fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/grpc/grpc.go

@@ -178,7 +178,7 @@ func (g *grpcServer) handler(srv interface{}, stream grpc.ServerStream) error {
 
 	fullMethod, ok := grpc.MethodFromServerStream(stream)
 	if !ok {
-		return grpc.Errorf(codes.Internal, "method does not exist in context")
+		return status.Errorf(codes.Internal, "method does not exist in context")
 	}
 
 	serviceName, methodName, err := mgrpc.ServiceMethod(fullMethod)

server/rpc_server.go

@@ -880,13 +880,10 @@ func (s *rpcServer) Stop() error {
 	ch := make(chan error)
 	s.exit <- ch
 
-	var err error
-	select {
-	case err = <-ch:
-		s.Lock()
-		s.started = false
-		s.Unlock()
-	}
+	err := <-ch
+	s.Lock()
+	s.started = false
+	s.Unlock()
 
 	return err
 }