Fix typo in memset call

--- ./libteredo/peerlist.c
+++ ./libteredo/peerlist.c
@@ -288,7 +288,7 @@ teredo_peerlist *teredo_list_create (unsigned max, unsigned expiration)
 	if (l == NULL)
 		return NULL;
 
-	memset (l, 0, sizeof (l));
+	memset (l, 0, sizeof (*l));
 	pthread_mutex_init (&l->lock, NULL);
 	l->recent = l->old = NULL;
 	l->left = max;