make_parts(): Fix case of comparing against uninitialized variables

make_parts(): Fix case of comparing against uninitialized variables

Silencing gcc's warning of uninitialized variables was hiding a bug
where if we have /dev/md64 as a symlink, and /dev/md64p1 was a real
device node.

In this case major_num and minor_num would not get populated, but we
end up comparing against them because the stat for md64p1 succeeds.

Instead of using the int foo = foo trick, change the code to set
set the variables to invalid values so comparisons will fail.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>