clientv3: Fix govet errors

clientv3/leasing/cache.go

@@ -298,7 +298,7 @@ func (lc *leaseCache) evalOps(ops []v3.Op) ([]*v3pb.ResponseOp, bool) {
 		}
 		resps[i] = &v3pb.ResponseOp{
 			Response: &v3pb.ResponseOp_ResponseRange{
-				(*v3pb.RangeResponse)(resp),
+				ResponseRange: (*v3pb.RangeResponse)(resp),
 			},
 		}
 	}

clientv3/leasing/txn.go

@@ -85,7 +85,7 @@ func (txn *txnLeasing) eval() (*v3.TxnResponse, error) {
 	if !ok {
 		return nil, nil
 	}
-	return &v3.TxnResponse{copyHeader(txn.lkv.leases.header), succeeded, resps}, nil
+	return &v3.TxnResponse{Header: copyHeader(txn.lkv.leases.header), Succeeded: succeeded, Responses: resps}, nil
 }
 
 // fallback computes the ops to fetch all possible conflicting