[U-Boot] [BUG] divide by 0 in spi flash probe

Hi,

I'm updating support for a board which uses the Armada-385 from u-boot v2016.05 to use the latest master (v2016.09-rc2 plus a bit).

When I run "sf probe" I get a divide by 0 in mvebu_spi_set_speed because hz has made it through as 0.

When I run saveenv (env is in SPI) I don't get the divide by 0.

I'll do some more digging tomorrow but just thought I'd get this email off now in case it rings any bells for anyone.

Thanks, Chris