The tests added by commit 866e24d4 failed on big-endian machines
due to lack of attention to endianness considerations.  Fix that.

While here, improve a few small cosmetic things, such as running
it through perltidy.

Mark Dilger

Discussion: https://postgr.es/m/30B8E99A-2D9C-48D4-A55C-741C9D5F1563@enterprisedb.com