[php-src] PR #25409: ext/pgsql: fix the wrong names in the pg_lo_write() and pg_lo_read() errors

Pull Request: https://github.com/php/php-src/pull/25409 Author: lacatoire - pg_lo_write() referred to a nonexistent $buf parameter; it is $data. - pg_lo_read() is the only check worded "greater or equal than"; use "greater than or equal to" like the rest of the file. Before: ``` pg_lo_write(): Argument #3 ($length) must be less than or equal to the length of argument #2 ($buf) pg_lo_read(): Argument #2 ($length) must be greater or equal than 0 ``` After: ``` pg_lo_write(): Argument #3 ($length) must be less than or equal to the length of argument #2 ($data) pg_lo_read(): Argument #2 ($length) must be greater than or equal to 0 ```