libfc: Differentiate echange timer cancellation debug statements

There are two debug statements with the same output string regarding
echange timer cancellation. This patch simply changes the output of
one string so that they can be differentiated.
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Tested-by: NJack Morgan <jack.morgan@intel.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>

drivers/scsi/libfc/fc_exch.c

@@ -1567,7 +1567,7 @@ static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
 		    fc_exch_rctl_name(fh->fh_r_ctl));
 
 	if (cancel_delayed_work_sync(&ep->timeout_work)) {
-		FC_EXCH_DBG(ep, "Exchange timer canceled\n");
+		FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n");
 		fc_exch_release(ep);	/* release from pending timer hold */
 	}