Merge pull request #10312 from richardkchapman/coverity-uninit

HPCC-18101 Coverity: Uninitialized members (UNINIT_CTOR)

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>

ecl/hql/hqlstack.hpp

@@ -87,7 +87,7 @@ private:
     unsigned   tos;
     unsigned   sp;
     char*      stackbuf;
-    char*      toFree[MAXARGS];
+    char*      toFree[MAXARGS] = {};
     int        numToFree;
     bool       hasMeta;
     Owned<IRtlFieldTypeDeserializer> deserializer;