simplify a bit

cmd/crt.go

@@ -35,12 +35,11 @@ func crt(cmd *cobra.Command, args []string) {
 
 	ns := make([]*big.Int, len(moduli))
 	for i := range moduli {
-		n, ok := new(big.Int).SetString(moduli[i], 10)
+		var ok bool
+		ns[i], ok = new(big.Int).SetString(moduli[i], 10)
 		if !ok {
 			log.Fatal("invalid input " + moduli[i])
 		}
-
-		ns[i] = new(big.Int).Set(n)
 	}
 
 	// TODO: support non-pairwise coprime moduli