Make loc_network_tree_* functions propertly private

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/libloc.sym

-LIBLOC_PRIVATE {
-global:
-	# Network Tree
-	loc_network_tree_add_network;
-	loc_network_tree_count_networks;
-	loc_network_tree_count_nodes;
-	loc_network_tree_dump;
-	loc_network_tree_new;
-	loc_network_tree_unref;
-};
-
 LIBLOC_1 {
 global:
 	loc_ref;

src/libloc/network.h

@@ -68,7 +68,6 @@ struct loc_network_list* loc_network_exclude_list(
 
 #ifdef LIBLOC_PRIVATE
 
-
 static inline struct in6_addr address_increment(const struct in6_addr* address) {
 	struct in6_addr a = *address;