Merge r1688274 from trunk.

http: Fix LimitRequestBody checks when there is no more bytes to read.

Submitted by: Michael Kaufmann <mail michael-kaufmann.ch>
Committed by: ylavic
Reviewed  by: ylavic, mrumph, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1688935 13f79535-47bb-0310-9956-ffa450edef68