Fix Coverity Scan CID 21929 (Using uninitialized value newtbl.num_elements...

Fix Coverity Scan CID 21929 (Using uninitialized value newtbl.num_elements when calling hashtable_insert.)

common/utils/hashtable/hashtable.c

@@ -358,6 +358,7 @@ hashtable_rc_t hashtable_resize(hash_table_t *const hashtblP, const hash_size_t
 
   newtbl.size     = sizeP;
   newtbl.hashfunc = hashtblP->hashfunc;
+  newtbl.num_elements = 0;
 
   if(!(newtbl.nodes=calloc(sizeP, sizeof(hash_node_t *)))) return -1;