pgsql: Don't call fwrite() with len == 0 when writing out relcache init

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Don't call fwrite() with len == 0 when writing out relcache init
Date: 2022-03-23 20:36:13
Message-ID: E1nX7iG-0014Vm-P1@gemulon.postgresql.org
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Don't call fwrite() with len == 0 when writing out relcache init file.

Noticed via -fsanitize=undefined.

Backpatch to all branches, for the same reasons as 46ab07ffda9.

Discussion: https://postgr.es/m/20220323173537.ll7klrglnp4gn2um@alap3.anarazel.de
Backpatch: 10-

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8014c61ebda10d39ef8855b4826aeba5cacd36e1

Modified Files
--------------
src/backend/utils/cache/relcache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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