scsi: target: Simplify core_tmr_handle_tas_abort()

scsi: target: Simplify core_tmr_handle_tas_abort()

The code that can set CMD_T_TAS is executed by the same thread as the
thread that executes core_tmr_handle_tas_abort(). That means that no
locking is needed to check CMD_T_TAS from inside
core_tmr_handle_tas_abort(). This patch does not change any functionality.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>