Call bufferevent_free before closing file descriptor associated with it

or bugs in $EventMechanism on $OtherOS makes libevent get it's knickers
in a twist. From Dylan Alex Simon.

job.c

@@ -124,10 +124,10 @@ job_free(struct job *job)
 
 	if (job->pid != -1)
 		kill(job->pid, SIGTERM);
-	if (job->fd != -1)
-		close(job->fd);
 	if (job->event != NULL)
 		bufferevent_free(job->event);
+	if (job->fd != -1)
+		close(job->fd);
 
 	xfree(job);
 }