Fix issues with uncleared variables when loading old save games.

src/saveload/station_sl.cpp

@@ -327,6 +327,10 @@ static void SwapPackets(GoodsEntry *ge)
 
 static void Load_STNS()
 {
+	_cargo_source_xy = 0;
+	_cargo_days = 0;
+	_cargo_feeder_share = 0;
+
 	int index;
 	while ((index = SlIterateArray()) != -1) {
 		Station *st = new (index) Station();
@@ -519,8 +523,9 @@ static void Save_STNN()
 
 static void Load_STNN()
 {
-	int index;
+	_num_flows = 0;
 
+	int index;
 	while ((index = SlIterateArray()) != -1) {
 		bool waypoint = (SlReadByte() & FACIL_WAYPOINT) != 0;