smb/client: refactor ntstatus_to_dos() to return mapping entry

smb/client: refactor ntstatus_to_dos() to return mapping entry

Refactor ntstatus_to_dos() to return a pointer to the mapping entry
instead of using output parameters. This allows callers to access all
fields of the entry directly.

In map_smb_to_linux_error(), integrate the printing logic directly
to avoid redundant lookups previously performed by cifs_print_status(),
which is now removed.

Signed-off-by: Huiwen He <hehuiwen@kylinos.cn>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Steve French <stfrench@microsoft.com>