pgsql: Manual cleanup and pgindent of pgstat and bufmgr related code

Manual cleanup and pgindent of pgstat and bufmgr related code

This is in preparation for commiting a larger patch series in the area.

Discussion: /messages/by-id/CAAKRu_bHwGEbzNxxy+MQDkrsgog6aO6iUvajJ4d6PD98gFU7+w@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/250c8ee07ede8a104ae1471f6ebca204d94267dd

Modified Files
--------------
src/backend/storage/buffer/bufmgr.c | 22 +++++++++++-----------
src/backend/storage/buffer/localbuf.c | 4 ++--
src/backend/utils/activity/pgstat.c | 3 ++-
src/backend/utils/activity/pgstat_relation.c | 1 +
src/backend/utils/adt/pgstatfuncs.c | 2 +-
src/include/pgstat.h | 1 +
src/include/utils/pgstat_internal.h | 1 +
7 files changed, 19 insertions(+), 15 deletions(-)