Avoid non-constant format string argument to fprintf().
As Tom Lane pointed out, it could defeat the compiler's printf() format
string verification.
Backpatch to v12, like that patch that introduced it.
Discussion: https://www.postgresql.org/message-id/1069283.1597672779%40sss.pgh.pa.us
Branch
------
REL_13_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/bff41b2b8938f5e3e7d536da6d7a14a1648b4dec
Modified Files
--------------
src/bin/pg_basebackup/pg_basebackup.c | 2 +-
src/bin/pg_checksums/pg_checksums.c | 2 +-
src/bin/pg_rewind/pg_rewind.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
