Properly handle deleting everything out of a hash table.

src/var.c

@@ -753,11 +753,15 @@ void DestroyVars(int all)
         next = hash_table_next(&VHashTbl, v);
         if (all || !v->preserve) {
             DestroyValue(v->v);
-            hash_table_delete(&VHashTbl, v);
+            hash_table_delete_no_resize(&VHashTbl, v);
             free(v);
         }
         v = next;
     }
+    if (all) {
+        hash_table_free(&VHashTbl);
+        InitVars();
+    }
 }
 
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