Fix cuda check mistake
Fix cuda check mistake

keisuke-umezawa/chainer,hvy/chainer,anaruse/chainer,rezoo/chainer,okuta/chainer,wkentaro/chainer,aonotas/chainer,keisuke-umezawa/chainer,chainer/chainer,wkentaro/chainer,ktnyt/chainer,chainer/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,jnishi/chainer,okuta/chainer,hvy/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,jnishi/chainer,ronekko/chainer,wkentaro/chainer,okuta/chainer,okuta/chainer,tkerola/chainer,pfnet/chainer,keisuke-umezawa/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,ktnyt/chainer,hvy/chainer,jnishi/chainer