Revert "scsi: target/iscsi: Reduce number of __iscsit_free_cmd() callers"

The cxgbit driver expects that __iscsit_free_cmd() is called before the
target core frees the command page list. Since this patch breaks the
cxgbit driver, revert it.

Reported-by: Varun Prakash <varun@chelsio.com>
Fixes: ed88f055 ("scsi: target/iscsi: Reduce number of __iscsit_free_cmd() callers")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Varun Prakash <varun@chelsio.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>