Use NULL instead of 0 for 'arg' argument in dshash_create() calls.

Nathan Bossart <nathan@postgresql.org>

Commit: 5fe08c006c826da4a7f5db2a79327477599edbc6
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2024-02-26T21:46:01Z
Releases: 17.0
Use NULL instead of 0 for 'arg' argument in dshash_create() calls.

A couple of dshash_create() callers provide 0 for the 'void *arg'
argument, which might give readers the incorrect impression that
this is some sort of "flags" parameter.

Reviewed-by: Andy Fan
Discussion: https://postgr.es/m/20240119215941.GA1322079%40nathanxps13

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