iscsi: Use blk_queue_flag_set()

Use blk_queue_flag_set() instead of open-coding this function.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Acked-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/scsi/iscsi_tcp.c

@@ -948,7 +948,7 @@ static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
 
 static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
 {
-	set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
+	blk_queue_flag_set(QUEUE_FLAG_BIDI, sdev->request_queue);
 	return 0;
 }