Merge r589461, r602491 from trunk:

Prevent 1-byte overflow on 8192 boundary (see PR 43310)


Alternate fix... profiling indicates that the string
termination is completely unneeded and superflous. In
which case, the original allocation size is sufficient
since nothing external worries about a NULL nor
looks for it.

Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@602536 13f79535-47bb-0310-9956-ffa450edef68