* mod_include: fix potential segfault in get_include_var

    http://markmail.org/message/jlc7t5edsjujbe37
       Trunk patch: http://svn.apache.org/viewvc?view=rev&revision=795445
                       http://svn.apache.org/viewvc?view=rev&revision=795446
                                       http://svn.apache.org/viewvc?view=rev&revision=795642
                                          2.2.x patch: http://people.apache.org/~niq/patches/mod_include_get_include_var.patch
                                             +1: niq, minfrin, jim




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@795758 13f79535-47bb-0310-9956-ffa450edef68