[SeaBIOS] Get rid of a compile time dprintf warning

[Dave Frodin]

Thanks for looking into this.

I'm using gcc version 4.6.3

> > 
> > I'm building this in cygwin, and using our (Sage's) toolchain.
> 
> What version of gcc is it?
> 
> If I change the format to %ld I get:
> 
>   Compile checking out/post.o
> src/post.c: In function ‘reloc_init’:
> src/post.c:350:5: warning: format ‘%ld’ expects argument of type
> ‘long int’, but argument 4 has type ‘int’ [-Wformat]
> 
> Which is what I'd expect.  Maybe there is something odd with your
> version of gcc?
> 
> $ gcc --version
> gcc (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2)
> 
> and I get similar behavior with gcc v3.4.
> 
> -Kevin
>