Fix convolution_nd dtype check
Fix convolution_nd dtype check

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