cr-dump: fix memory leak in fill_zombies_pids

CID 996204 (#1 of 1): Resource leak (RESOURCE_LEAK)
11. leaked_storage: Variable "ch" going out of scope leaks the storage it points to.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -1304,6 +1304,8 @@ static int fill_zombies_pids(struct pstree_item *item)
 		BUG_ON(i == nr);
 	}
 
+	xfree(ch);
+
 	return 0;
 }