Fix crash du to bad traversing of hills.

termite.c

@@ -11,23 +11,21 @@
 void termite_play_turn (Rules *rules,
 		State *state)
 {
-	guint i;
+	gint i;
 	gint food_index, ant_index;
 	guint distance; // Manhattan distance
 	Tile *food;
 	Tile *ant;
 	Tile *hill;
 	gchar dir;
 
-	// Keep enemy hills only
-	for (i = 0; i < state->n_hills; ++i) 
+	// Keep enemy hills only. We need to iterate from last to first to 
+	// test all items as we remove last element
+	for (i = state->n_hills - 1; i >= 0 ; --i) 
 	{
 		Tile *tile = state->hills[i];
-		if (hill_get_owner (&tile->with.hill) == 0)
-		{
-			state->hills[i] = state->hills[state->n_hills - 1];
+		if (! tile_has_enemy_hill (tile))
 			state->n_hills--;
-		}
 	}
 
 	// Process each ant

tile.c

@@ -34,7 +34,7 @@ inline gboolean tile_is_free (Tile *tile)
 			&& tile->type != TILE_TYPE_FOOD);
 }
 
-inline gboolean tile_is_ennemy_hill (Tile *tile)
+inline gboolean tile_has_enemy_hill (Tile *tile)
 {
 	assert (tile != NULL);
 	return (tile->flags & TILE_HAS_HILL && tile->with.hill.owner != 0);

tile.h

@@ -43,7 +43,7 @@ void tile_set_type (Tile *tile,
 
 TileType tile_get_type (Tile *tile);
 gboolean tile_is_free (Tile *tile);
-gboolean tile_is_ennemy_hill (Tile *tile);
+gboolean tile_has_enemy_hill (Tile *tile);
 void tile_set_flags (Tile *tile, guint16 flags);
 guint16 tile_get_flags (Tile *tile);
 gchar tile_get_ascii_type (Tile *tile);