Fix a NULL pointer dereference

* server/scoreboard.c (ap_increment_counts): In certain cases like certain
  invalid requests r->method might be NULL here. r->method_number defaults
  to M_GET and hence is M_GET in these cases.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1878092 13f79535-47bb-0310-9956-ffa450edef68
