Fix format specifier warnings

Commit 5dbf6c5 did not address these format specifier warnings
since they were introduced by an unrelated commit which had not
been rebased on 5dbf6c5 when merged.  Fix them.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12435

module/zfs/arc.c

@@ -8354,8 +8354,8 @@ l2arc_write_size(l2arc_dev_t *dev)
 		    "plus the overhead of log blocks (persistent L2ARC, "
 		    "%llu bytes) exceeds the size of the cache device "
 		    "(guid %llu), resetting them to the default (%d)",
-		    l2arc_log_blk_overhead(size, dev),
-		    dev->l2ad_vdev->vdev_guid, L2ARC_WRITE_SIZE);
+		    (u_longlong_t)l2arc_log_blk_overhead(size, dev),
+		    (u_longlong_t)dev->l2ad_vdev->vdev_guid, L2ARC_WRITE_SIZE);
 		size = l2arc_write_max = l2arc_write_boost = L2ARC_WRITE_SIZE;
 
 		if (arc_warm == B_FALSE)