target: use correct sense code for LUN communication failure

commit 18a9df42 upstream.

The ASC/ASCQ code for 'Logical Unit Communication failure' is
0x08/0x00; 0x80/0x00 is vendor specific.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: Nicholas Bellinger <nab@risingtidesystems.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
[bwh: Backported to 3.2: add offset to buffer index]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/target/target_core_transport.c

@@ -4539,7 +4539,7 @@ int transport_send_check_condition_and_sense(
 		/* ILLEGAL REQUEST */
 		buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
 		/* LOGICAL UNIT COMMUNICATION FAILURE */
-		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x08;
 		break;
 	}
 	/*