In MDEV-13103, I made a mistake in the error handling of
page_compressed=1 decryption when the default
innodb_compression_algorithm=zlib is used.
Due to this mistake, with certain versions of zlib,
MariaDB would fail to detect a corrupted page.

The problem was uncovered by the following tests:
mariabackup.unencrypted_page_compressed
mariabackup.encrypted_page_compressed