LU-9679 llite: Discard LUSTRE_FPRIVATE()

LU-9679 llite: Discard LUSTRE_FPRIVATE()

The LUSTRE_FPRIVATE() macro adds no value.
Instead of
  LUSTRE_FPRIVATE(file)
use
  file->private_data

which is shorter and more familiar, and widely used
elsewhere in lustre.

Also re-indent several functions where this was changed, to
use TABs.
Also join together some strings that were split across 2
lines.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I811aea8069b22beed15fd96d8c6bef8eca42defd
Reviewed-on: https://review.whamcloud.com/36652
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Arshad Hussain <arshad.super@gmail.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>