MINOR: fd: Set owner and iocb field before inserting a new fd in the fdtab

This will be needed for concurrent accesses.
diff --git a/include/proto/connection.h b/include/proto/connection.h
index 9be862b..2ec2ef8 100644
--- a/include/proto/connection.h
+++ b/include/proto/connection.h
@@ -108,12 +108,12 @@
 	if (!conn_ctrl_ready(conn)) {
 		int fd = conn->handle.fd;
 
+		fdtab[fd].owner = conn;
+		fdtab[fd].iocb = conn_fd_handler;
 		fd_insert(fd);
 		/* mark the fd as ready so as not to needlessly poll at the beginning */
 		fd_may_recv(fd);
 		fd_may_send(fd);
-		fdtab[fd].owner = conn;
-		fdtab[fd].iocb = conn_fd_handler;
 		conn->flags |= CO_FL_CTRL_READY;
 	}
 }