net] gianfar: prevent integer wrapping in the rx handler
>
>From: Andy Spencer
>Date: Thu, 25 Jan 2018 19:37:50 -0800
>
>> When the frame check sequence (FCS) is split across the last two frames
>> of a fragmented packet, part of the FCS gets counted twice, once when
>>
From: Andy Spencer
Date: Thu, 25 Jan 2018 19:37:50 -0800
> When the frame check sequence (FCS) is split across the last two frames
> of a fragmented packet, part of the FCS gets counted twice, once when
> subtracting the FCS, and again when subtracting the previously received
> data.
>
> For exa
