ksmbd: Fix to handle removal of rfc1002 header from smb_hdr

ksmbd: Fix to handle removal of rfc1002 header from smb_hdr

The commit that removed the RFC1002 header from struct smb_hdr didn't also
fix the places in ksmbd that use it in order to provide graceful rejection
of SMB1 protocol requests.

Fixes: 83bfbd0bb902 ("cifs: Remove the RFC1002 header from smb_hdr")
Reported-by: Namjae Jeon <linkinjeon@kernel.org>
Link: https://lore.kernel.org/r/CAKYAXd9Ju4MFkkH5Jxfi1mO0AWEr=R35M3vQ_Xa7Yw34JoNZ0A@mail.gmail.com/
Cc: ChenXiaoSong <chenxiaosong.chenxiaosong@linux.dev>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>