x/crypto/ssh: if debugMux is set, also log global messages.

Change-Id: I685ba7f30f1d2e2bc3c078c7bddb6d383a179113
Reviewed-on: https://go-review.googlesource.com/22416
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>

ssh/channel.go

diff --git a/ssh/channel.go b/ssh/channel.go
index 5403c7e..6671c98 100644
--- a/ssh/channel.go
+++ b/ssh/channel.go
@@ -217,7 +217,7 @@
 
 func (c *channel) sendMessage(msg interface{}) error {
 	if debugMux {
-		log.Printf("send %d: %#v", c.mux.chanList.offset, msg)
+		log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
 	}
 
 	p := Marshal(msg)
@@ -371,7 +371,7 @@
 	close(c.msg)
 	close(c.incomingRequests)
 	c.writeMu.Lock()
-	// This is not necesary for a normal channel teardown, but if
+	// This is not necessary for a normal channel teardown, but if
 	// there was another error, it is.
 	c.sentClose = true
 	c.writeMu.Unlock()

ssh/mux.go

diff --git a/ssh/mux.go b/ssh/mux.go
index a2af7f4..fb54c8b 100644
--- a/ssh/mux.go
+++ b/ssh/mux.go
@@ -131,6 +131,9 @@
 
 func (m *mux) sendMessage(msg interface{}) error {
 	p := Marshal(msg)
+	if debugMux {
+		log.Printf("send global(%d): %#v", m.chanList.offset, msg)
+	}
 	return m.conn.writePacket(p)
 }