Merge r1638073 from trunk:

* server/scoreboard.c: Check for child_num < 0 also in ap_update_child_status
and ap_update_child_status_from_conn. PR 56767.

Submitted by: jkaluza
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1642851 13f79535-47bb-0310-9956-ffa450edef68