The endpoint type should also be checked before a device
is accepted.

Reported-by:  <syzbot+5efc10c005014d061a74@syzkaller.appspotmail.com>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>