Get rid of this warning:

Get rid of this warning:

src/cpu/amd/model_10xxx/fidvid.c:758:
	warning: 'fid_max' may be used uninitialized in this function

Quoting Marc:

It [fid_max] should be initialized to 0. The !nb_cof_vid_update would mean that
the fidmax shouldn't change so the value isn't important, but 0 would be the
safest if there is another hole in the logic and CPUs are not matched.

Signed-off-by: Myles Watson <mylesgw@gmail.com>
Acked-by: Myles Watson <mylesgw@gmail.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5577 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1