target: Fix assignment of LUN in tracepoints

The unpacked_lun field in the SCSI target tracepoints should be
initialized with cmd->orig_fe_lun rather than cmd->se_lun->unpacked_lun
for two reasons:

 - most importantly, if we are in the cmd_complete tracepoint
   returning a check condition due to no LUN found, cmd->se_lun will
   be NULL and we'll crash trying to dereference it.

 - also, in any case, cmd->se_lun->unpacked_lun is an internal index
   into the target's internal set of LUNs; cmd->orig_fe_lun is much
   more useful and interesting, since it's the value the initiator
   actually sent.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: <stable@vger.kernel.org> # 3.11+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

include/trace/events/target.h

@@ -144,7 +144,7 @@ TRACE_EVENT(target_sequencer_start,
 	),
 
 	TP_fast_assign(
-		__entry->unpacked_lun	= cmd->se_lun->unpacked_lun;
+		__entry->unpacked_lun	= cmd->orig_fe_lun;
 		__entry->opcode		= cmd->t_task_cdb[0];
 		__entry->data_length	= cmd->data_length;
 		__entry->task_attribute	= cmd->sam_task_attr;
@@ -182,7 +182,7 @@ TRACE_EVENT(target_cmd_complete,
 	),
 
 	TP_fast_assign(
-		__entry->unpacked_lun	= cmd->se_lun->unpacked_lun;
+		__entry->unpacked_lun	= cmd->orig_fe_lun;
 		__entry->opcode		= cmd->t_task_cdb[0];
 		__entry->data_length	= cmd->data_length;
 		__entry->task_attribute	= cmd->sam_task_attr;