Our Ref.ref are ints. remove a warning in print here.

Reference: /n/patches.lsub.org/patch/sshwarn
Date: Wed Apr 25 16:01:42 CES 2012
Signed-off-by: nemo@lsub.org

--- /sys/src/cmd/ssh2/sshtun.c	Sun Apr 15 22:26:44 2012
+++ /sys/src/cmd/ssh2/sshtun.c	Wed Apr 25 16:00:44 2012
@@ -2767,7 +2767,7 @@
 		if (c->state != Closed)
 			c->state = Closing;
 		if (debug)
-			fprint(2, "clone %ld ctl %ld data %ld listen %ld local %ld remote %ld status %ld\n",
+			fprint(2, "clone %d ctl %d data %d listen %d local %d remote %d status %d\n",
 				c->clonefile->ref, c->ctlfile->ref, c->datafile->ref, c->listenfile->ref, c->localfile->ref,
 				c->remotefile->ref, c->statusfile->ref);
 	}