crypto: fix build with Go 1.5

crypto/curve.go

@@ -60,7 +60,14 @@ type BitCurve struct {
 }
 
 func (BitCurve *BitCurve) Params() *elliptic.CurveParams {
-	return &elliptic.CurveParams{BitCurve.P, BitCurve.N, BitCurve.B, BitCurve.Gx, BitCurve.Gy, BitCurve.BitSize}
+	return &elliptic.CurveParams{
+		P:       BitCurve.P,
+		N:       BitCurve.N,
+		B:       BitCurve.B,
+		Gx:      BitCurve.Gx,
+		Gy:      BitCurve.Gy,
+		BitSize: BitCurve.BitSize,
+	}
 }
 
 // IsOnBitCurve returns true if the given (x,y) lies on the BitCurve.