We can't pass in &r->remaining because we change that value on output to

be how many bytes we read.  This trounces on the r->remaining value, so
we must use a local variable and subtract that from r->remaining after we
read.
Reviewed by:	Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91413 13f79535-47bb-0310-9956-ffa450edef68