LU-10391 mgs: fix lots of white-space irregularities

LU-10391 mgs: fix lots of white-space irregularities

In preparation for changing the code, fix lots of white-space issues
in mgs_llog.c

Lustre-change: https://review.whamcloud.com/50091
Lustre-commit: 60e6e35f4cad3f79b2e96ddf41a8d8a02d6047ac

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I7fb40a473e3e4709778339b773988ec7079d20d8
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/55100
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>