Replace literal 0 with InvalidXLogRecPtr for XLogRecPtr assignments

Use the proper constant InvalidXLogRecPtr instead of literal 0 when
assigning XLogRecPtr variables and struct fields.

This improves code clarity by making it explicit that these are
invalid LSN values rather than ambiguous zero literals.

Author: Bertrand Drouvot <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ec317440716487753bafa4c0f8adae53e2c32446

Modified Files
--------------
src/backend/access/gist/gist.c              | 4 ++--
src/backend/access/transam/parallel.c       | 4 ++--
src/backend/access/transam/xlog.c           | 6 +++---
src/backend/access/transam/xlogprefetcher.c | 2 +-
src/backend/access/transam/xlogrecovery.c   | 6 +++---
src/backend/replication/syncrep.c           | 4 ++--
src/backend/replication/walreceiver.c       | 4 ++--
src/backend/storage/lmgr/proc.c             | 2 +-
src/bin/pg_resetwal/pg_resetwal.c           | 8 ++++----
src/bin/pg_rewind/pg_rewind.c               | 2 +-
10 files changed, 21 insertions(+), 21 deletions(-)

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