Simplify truncate_query_log() callers

truncate_query_log() returns NULL when statement truncation is
disabled or the supplied query does not need to be truncated. Therefore,
callers do not need to check log_statement_max_length before calling
it.

Remove the redundant checks and let truncate_query_log() make the
decision in one place. This simplifies the statement and duration
logging code without changing its behavior.

Author: Jim Jones <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/CAHGQGwFOV+7nOdfoO=kfVH=-fra9aqe1ychhlyty3nfq9rq...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5594f209c3eff6e478e1d6109094f14b59bd3dce

Modified Files
--------------
src/backend/tcop/postgres.c | 30 ++++++------------------------
1 file changed, 6 insertions(+), 24 deletions(-)

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