ksmbd: fix endless loop when encryption for response fails

If ->encrypt_resp return error, goto statement cause endless loop.
It send an error response immediately after removing it.

Fixes: 0626e664 ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>