access_flags_to_mode() gets on-the-wire data (little-endian) and treats
it as host-endian.

Introduced in commit e01b6400 ("[CIFS]
enable get mode from ACL when cifsacl mount option specified")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>