Check if an event is initialized before calling event_del().

Libevent prints a warning to stderr if we do that.

src/graph.c

@@ -349,6 +349,7 @@ void check_reachability() {
 			n->minmtu = 0;
 			n->mtuprobes = 0;
 
+			if(timeout_initialized(&n->mtuevent))
 				event_del(&n->mtuevent);
 
 			xasprintf(&envp[0], "NETNAME=%s", netname ? : "");

src/net.c

@@ -375,6 +375,8 @@ int main_loop(void) {
 	signal_del(&sighup_event);
 	signal_del(&sigterm_event);
 	signal_del(&sigquit_event);
+
+	if(timeout_initialized(&timeout_event))
 		event_del(&timeout_event);
 
 	return 0;

src/net_socket.c

@@ -462,7 +462,7 @@ void handle_meta_write(int sock, short events, void *data) {
 	}
 
 	buffer_read(&c->outbuf, outlen);
-	if(!c->outbuf.len)
+	if(!c->outbuf.len && event_initialized(&c->outevent))
 		event_del(&c->outevent);
 }
 
@@ -476,6 +476,7 @@ void setup_outgoing_connection(outgoing_t *outgoing) {
 	connection_t *c;
 	node_t *n;
 
+	if(event_initialized(&outgoing->ev))
 		event_del(&outgoing->ev);
 
 	n = lookup_node(outgoing->name);

src/node.c

@@ -85,6 +85,7 @@ void free_node(node_t *n) {
 	cipher_close(&n->outcipher);
 	digest_close(&n->outdigest);
 
+	if(timeout_initialized(&n->mtuevent))
 		event_del(&n->mtuevent);
 	
 	if(n->hostname)

src/protocol.c

@@ -228,5 +228,6 @@ void init_requests(void) {
 void exit_requests(void) {
 	splay_delete_tree(past_request_tree);
 
+	if(timeout_initialized(&past_request_event))
 		event_del(&past_request_event);
 }