Implement neighbour_txcost.

neighbour.c

@@ -256,6 +256,13 @@ reset_txcost(struct neighbour *neigh)
     return 0;
 }
 
+int
+neighbour_txcost(struct neighbour *neigh)
+{
+    reset_txcost(neigh);
+    return neigh->txcost;
+}
+
 int
 check_neighbours()
 {
@@ -340,8 +347,7 @@ neighbour_cost(struct neighbour *neigh)
     if(!neigh->network->up)
         return INFINITY;
 
-    reset_txcost(neigh);
-    a = neigh->txcost;
+    a = neighbour_txcost(neigh);
 
     if(a >= INFINITY)
         return INFINITY;

neighbour.h

@@ -51,5 +51,6 @@ struct neighbour *add_neighbour(const unsigned char *id,
                                 struct network *net);
 int update_neighbour(struct neighbour *neigh, int hello, int hello_interval);
 int check_neighbours(void);
+int neighbour_txcost(struct neighbour *neigh);
 int neighbour_rxcost(struct neighbour *neigh);
 int neighbour_cost(struct neighbour *neigh);