The allocated memory didn't free under an error
path in smb2_handle_negotiate().

Fixes: e2f34481 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17815
Signed-off-by: NNamjae Jeon <linkinjeon@kernel.org>
Reviewed-by: NHyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>