fix: security issues found by static scan (facebookincubator#11487)

Summary:
- Possible memory leak

Pull Request resolved: facebookincubator#11487

Reviewed By: pedroerp

Differential Revision: D65763889

Pulled By: kevinwilfong

fbshipit-source-id: d50c47e80a2a4783e8a9193a801a7f733cb55f2b

velox/tpch/gen/dbgen/dbgen_gunk.cpp

@@ -1,3 +1,18 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 /*
  * Copyright owned by the Transaction Processing Performance Council.
  *
@@ -57,6 +72,10 @@ static void cleanup_dist(distribution* target) {
     }
     free(target->list);
   }
+  /* Allocated from permute_dist */
+  if (target->permute) {
+    free(target->permute);
+  }
 }
 
 void cleanup_dists(void) {