Don't reenlist the client imsg event every loop, instead have a small function

to it and call it after the event triggers or after a imsg is added.

server.c

@@ -160,11 +160,11 @@ server_start(char *path)
 	log_debug("socket path %s", socket_path);
 	setproctitle("server (%s)", rpathbuf);
 
+	event_init();
+
 	server_fd = server_create_socket();
 	server_client_create(pair[1]);
 
-	event_init();
-
 	if (access(SYSTEM_CFG, R_OK) == 0) {
 		if (load_cfg(SYSTEM_CFG, NULL, &cause) != 0)
 			goto error;
@@ -215,8 +215,6 @@ server_loop(void)
 	while (!server_should_shutdown()) {
 		server_update_socket();
 
-		server_client_prepare();
-
 		event_loopexit(&tv);
 		event_loop(EVLOOP_ONCE);