go-kosu: use pointer types in poster limit

packages/go-kosu/abci/rebalance.go

@@ -77,15 +77,15 @@ func posterIterator(app *App, totalBalance *big.Int) func(string, *types.Poster)
 // calculates a poster's period limit based on their balance and the total poster balance
 func posterLimit(periodLimit uint64, posterBalance, totalBalance *big.Int) uint64 {
 	// copy periodLimit (pl), posterBalance (pb), totalBalance (tb)
-	var pl, pb, tb big.Int
+	var pl, pb, tb *big.Int
 	pl.SetUint64(periodLimit)
 	pb.Set(posterBalance)
 	tb.Set(totalBalance)
 
 	// limit = (posterBalance / totalBalance) * periodLimit
 	limit := big.NewInt(0)
-	limit.Mul(&pl, &pb)
-	limit.Div(limit, &tb)
+	limit.Mul(pl, pb)
+	limit.Div(limit, tb)
 
 	if !limit.IsUint64() {
 		return math.MaxUint64