memleak: prepare for htable to be a tal object.

Since it gets resized during traverse, we would crash by
keeping a pointer to the old one.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

common/memleak.c

@@ -107,6 +107,10 @@ static void children_into_htable(struct htable *memtable, const tal_t *p)
 			if (streq(name, "tmpctx"))
 				continue;
 		}
+		/* Don't add (resizing!) memtable table! */
+		if (i == memtable->table)
+			continue;
+
 		htable_add(memtable, hash_ptr(i, NULL), i);
 		children_into_htable(memtable, i);
 	}