Add allocation test for native_device (check ptr is not null)
Add allocation test for native_device (check ptr is not null)

okuta/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,ktnyt/chainer,wkentaro/chainer,keisuke-umezawa/chainer,hvy/chainer,jnishi/chainer,ktnyt/chainer,keisuke-umezawa/chainer,ktnyt/chainer,jnishi/chainer,ktnyt/chainer,niboshi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,hvy/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,okuta/chainer,pfnet/chainer,tkerola/chainer,wkentaro/chainer,jnishi/chainer,jnishi/chainer,chainer/chainer,chainer/chainer,okuta/chainer,chainer/chainer,niboshi/chainer