resources: handle overflow when aligning start of available area
If tmp.start is near ~0, ALIGN(tmp.start) may overflow, which would make us think there's more available space than there really is. We would likely return something that conflicts with a previous resource, which would cause a failure when allocate_resource() requests the newly- allocated region. Reference: https://bugzilla.redhat.com/show_bug.cgi?id=646027Reported-by: NFabrice Bellet <fabrice@bellet.info> Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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