nvme-tcp bricks my computer

[Sagi Grimberg]

> Hi Sagi,
> 
> Our kernel expert was able to try the patch you provided. This is his 
> comment:
> 
>     /[the patch] fixes the panic, but it’ll take the controller down so
>     it's unsable.  If we want it to ignore the error, it will need to be
>     a little different./

Thanks for verifying it fixes the crash, not sure we want to ignore this
error, while its not prohibited by the spec to send a 0-length R2T
(although it probably should be), the controller is obviously
buggy and we should probably stop talking to it..

I'll send a formal patch, thanks!