gofmt: apply gofmt -w src misc

Remove trailing whitespace in comments.
No other changes.

R=r
CC=golang-dev
https://golang.org/cl/6815053

conn.go

@@ -513,7 +513,7 @@ Again:
 		// First message, be extra suspicious:
 		// this might not be a TLS client.
 		// Bail out before reading a full 'body', if possible.
-		// The current max version is 3.1. 
+		// The current max version is 3.1.
 		// If the version is >= 16.0, it's probably not real.
 		// Similarly, a clientHello message encodes in
 		// well under a kilobyte.  If the length is >= 12 kB,