ksmbd: avoid to send duplicate oplock break notifications

This patch fixes generic/011 when oplocks is enable.

Avoid to send duplicate oplock break notifications like smb2 leases
case.

Fixes: 97c2ec64 ("ksmbd: avoid to send duplicate lease break notifications")
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>