server/mpm/event/event.c:2855: error: UNINITIALIZED_VALUE
  The value read from free_slots[_] was never initialized.

server/mpm/event/event.c:2855:17: 
2853.             for (i = 0; i < free_length; ++i) {
2854.                 bucket[free_slots[i]] = child_bucket;
2855.                 make_child(ap_server_conf, free_slots[i]);
                      ^
2856.             }
2857.             /* the next time around we want to spawn twice as many if this
