Run go fmt over runner.

Last set of changes didn't do that.

Change-Id: Iae24e75103529ce4d50099c5cbfbcef0e10ba663
Reviewed-on: https://boringssl-review.googlesource.com/5871
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index 0b8bfe5..be2d4cb 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -189,7 +189,7 @@
 	VerifiedChains             [][]*x509.Certificate // verified chains built from PeerCertificates
 	ChannelID                  *ecdsa.PublicKey      // the channel ID for this connection
 	SRTPProtectionProfile      uint16                // the negotiated DTLS-SRTP protection profile
-	TLSUnique                  []byte
+	TLSUnique                  []byte                // the tls-unique channel binding
 	SCTList                    []byte                // signed certificate timestamp list
 }