mod_ssl: Fix the error code returned in an error path of 'ssl_io_filter_handshake()'

This messes-up error handling performed in 'ssl_io_filter_error()'
+1: ylavic, jim, minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1847278 13f79535-47bb-0310-9956-ffa450edef68