Fix mod_proxy seg fault when the proxied server returns

an HTTP/0.9 response or a bogus status line.

Submitted by: Adam Sussman
Reviewed by:	Bill Stoddard


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92693 13f79535-47bb-0310-9956-ffa450edef68