Fix incidental warnings from cpluspluscheck.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 232720be9b6412ec2b6bee405299bcbbbe700f0b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-08-18T23:01:40Z
Releases: 13.0
Fix incidental warnings from cpluspluscheck.

Remove use of "register" keyword in hashfn.c.  It's obsolescent
according to recent C++ compilers, and no modern C compiler pays
much attention to it either.

Also fix one cosmetic warning about signed vs unsigned comparison.

Discussion: https://postgr.es/m/20518.1559494394@sss.pgh.pa.us

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