Fix a bug in the calculation of the buffer size for the line continuation

facility in Apache's configuration files which could lead to a buffer overflow
situation.

Submitted by: Thomas Devanneaux <Thomas.Devanneaux@enst.fr>
Reviewed by: Ralf S. Engelschall
PR: 3617


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82889 13f79535-47bb-0310-9956-ffa450edef68