Merge 394070 from trunk;

* Initialize last_char as otherwise a random value will be compared
  against APR_ASCII_LF at the end of the loop if bb only contains an
  EOS bucket.

PR: 39282
Submitted by: Davi Arnaut <davi haxent.com.br>
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@395197 13f79535-47bb-0310-9956-ffa450edef68