Cleanup the error bucket code a bit. This uses the error bucket directly

instead of using ap_bucket_read.  It also lets ap_die handle the fact that
the filter returned the error.
Submitted by:	Greg Stein


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87867 13f79535-47bb-0310-9956-ffa450edef68