pgsql: Change xl_hash_vacuum_one_page.ntuples from int to uint16.

Change xl_hash_vacuum_one_page.ntuples from int to uint16.

This will create two bytes of padding space in xl_hash_vacuum_one_page which
can be used for future patches. This makes the datatype of
xl_hash_vacuum_one_page.ntuples same as gistxlogDelete.ntodelete which is
advisable as both are used for the same purpose.

Author: Bertrand Drouvot
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/b0e20c40-cb7a-fc1c-c607-2a78dac5021e@gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a6cd1fc692eff708fd42c72b03f756fa1860530e

Modified Files
--------------
src/include/access/hash_xlog.h     | 4 ++--
src/include/access/xlog_internal.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)