go.crypto/ssh: run gofmt

gofmt got better at removing trailing whitespace.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6929044

ssh/mac.go

@@ -43,8 +43,8 @@ func (t truncatingMAC) Size() int {
 
 func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() }
 
-// Specifies a default set of MAC algorithms and a preference order. 
-// This is based on RFC 4253, section 6.4, with the removal of the 
+// Specifies a default set of MAC algorithms and a preference order.
+// This is based on RFC 4253, section 6.4, with the removal of the
 // hmac-md5 variants as they have reached the end of their useful life.
 var DefaultMACOrder = []string{"hmac-sha1", "hmac-sha1-96"}