firewire: use clamp and min3 macros

Use kernel.h's convenience macros.  Also omit a printk that should never
happen and won't matter much if it ever happened.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 8a8047d..68375bc 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1164,8 +1164,8 @@
 	 * specifies the max payload size as 2 ^ (max_payload + 2), so
 	 * if we set this to max_speed + 7, we get the right value.
 	 */
-	tgt->max_payload = min(device->max_speed + 7, 10U);
-	tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1);
+	tgt->max_payload = min3(device->max_speed + 7, 10U,
+				device->card->max_receive - 1);
 
 	/* Do the login in a workqueue so we can easily reschedule retries. */
 	list_for_each_entry(lu, &tgt->lu_list, link)