resetting subid

mapsys/map_osmload.c

@@ -1018,6 +1018,7 @@ void osm_marea_new (struct s_osmmarea *a, int max) {
 	}
 
 	a->marea->id = 0;
+	a->marea->subid = 0;
 	a->marea->type = MAREA_unknown;
 	a->marea->p = (struct map_pos*) a->marea->data;
 	a->marea->p_cnt = 0;