mgm/mul.go | 3 +--

diff --git a/mgm/mul.go b/mgm/mul.go
index ad3378ffbc1ee29fc5e7e5e3a8b985c3b62287c1d5339c7f8349f341385a41d3..3b88a4839f26e29b8c2f24365ba22c5e87dc28a853c9e5cb1787ffb438d938db 100644
--- a/mgm/mul.go
+++ b/mgm/mul.go
@@ -19,7 +19,6 @@ func (mgm *MGM) mul(xBuf, yBuf []byte) []byte {
 	mgm.x.SetBytes(xBuf)
 	mgm.y.SetBytes(yBuf)
 	mgm.z.SetInt64(0)
-	var i int
 	for mgm.y.BitLen() != 0 {
 		if mgm.y.Bit(0) == 1 {
 			mgm.z.Xor(mgm.z, mgm.x)
@@ -35,7 +34,7 @@ 		mgm.y.Rsh(mgm.y, 1)
 	}
 	zBytes := mgm.z.Bytes()
 	rem := len(xBuf) - len(zBytes)
-	for i = 0; i < rem; i++ {
+	for i := 0; i < rem; i++ {
 		mgm.mulBuf[i] = 0
 	}
 	copy(mgm.mulBuf[rem:], zBytes)