Revert "fix minor infoleak in get_user_ex()"

This reverts commit 9d25c78e which is
1c109fab upstream

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>