apic: Don't iterate past last used apic
local_apics are allocated sequentially and never removed, so we can stop any iterations that go to MAX_APICS as soon as we hit the first NULL. Looking at a small guest running a virtio-net workload with oprofile, this drops apic_get_delivery_bitmask() from #3 in the profile to down in the noise. Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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