usx2y: don't bother with memdup_user() for 16-byte structure

... when it can bloody well go into a local variable.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-12-28 17:22:51 -05:00
commit 3d46d7108d