MDEV-11546 main.ssl_7937 failed with timeout in buildbot on Windows
MDEV-11546 main.ssl_7937 failed with timeout in buildbot on Windows

fix ma_schannel_read_decrypt w.r.t handling of SECBUFFER_EXTRA.

Do not do pvio_read, if last call to DecryptMessage() returned SECBUFFER_EXTRA.

MariaDB/mariadb-connector-c,MariaDB/mariadb-connector-c,ottok/mariadb-connector-c,MariaDB/mariadb-connector-c,ottok/mariadb-connector-c,ottok/mariadb-connector-c