qla2xxx: fix crash due to task mgmt cmd type

tcm_qla2xxx_get_task_tag incorrectly assume command is
qla_tgt_cmd.  Add check to see if it's a scsi cmd or
task mgmt command.

Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -515,8 +515,13 @@ static void tcm_qla2xxx_set_default_node_attrs(struct se_node_acl *nacl)
 
 static u32 tcm_qla2xxx_get_task_tag(struct se_cmd *se_cmd)
 {
-	struct qla_tgt_cmd *cmd = container_of(se_cmd,
-				struct qla_tgt_cmd, se_cmd);
+	struct qla_tgt_cmd *cmd;
+
+	/* check for task mgmt cmd */
+	if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
+		return 0xffffffff;
+
+	cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
 
 	return cmd->tag;
 }