pg_basebackup: Correct type of WalSegSz
The pg_basebackup code had WalSegSz as uint32, whereas the rest of the
code has it as int. This seems confusing, and using the extra range
wouldn't actually work.
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/
1bf15c7a-0acd-1864-081e-
7a28814310fe%40enterprisedb.com