SECURITY: CVE-2017-3169 (cve.mitre.org)

SECURITY: CVE-2017-3169 (cve.mitre.org)
mod_ssl may dereference a NULL pointer when third-party modules call
ap_hook_process_connection() during an HTTP request to an HTTPS port.

Merge r1796343 from trunk:

mod_ssl: fix ctx passed to ssl_io_filter_error()

Consistently pass the expected bio_filter_in_ctx_t
to ssl_io_filter_error().

Submitted by: ylavic, covener
Reviewed by: covener, ylavic, jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1796854 13f79535-47bb-0310-9956-ffa450edef68