in_channels must be divisible by groups

[yoyolicoris]

https://github.com/fkodom/fft-conv-pytorch/blob/bbe43cd94c5839b1f11469547187ac1baa2c186c/fft_conv.py#L155

In L184 and L189, why the condition statement is *_channels % 2 != 0 but not *_channels % groups != 0? Seems not match with the error message.