[coreboot] ifwitool: Incorrect calculation of dst_size

[Rolf Evers-Fischer]

Hello Furquan,

On Mon, 13 Jun 2016, Furquan Shaikh wrote:

> Hello Rolf,
> Thanks for the fix! Yes, the correction looks good. Please feel free to push
> this change to gerrit on coreboot.org.
> 

thank you for your fast reply. I will try to push this change.

Best regards,
 Rolf