[SeaBIOS] Get rid of a compile time dprintf warning

[Kevin O'Connor]

On Wed, Jan 09, 2013 at 08:34:18AM -0600, Dave Frodin wrote:
> Here's a patch that's been lingering awhile. 
> thanks, 

Thanks.  I don't receive a warning for this - what is the exact
warning you receive?  I don't see why gcc would convert (datalow_end -
datalow_start) to a long.

-Kevin