Defensive coding -- protect against a possible future where while just_die()

is in effect something might be muddling in alloc.c's internal structure,
and one of the child_exit handlers may want to muddle there too.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78811 13f79535-47bb-0310-9956-ffa450edef68