target: Fix bidi command handling

The function transport_complete_qf() must call either
queue_data_in() or queue_status() but not both.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>