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commit 702f9260 upstream.

b4ff8389

 is incomplete: relies on nr_legacy_irqs() to get the number
of legacy interrupts when actually nr_legacy_irqs() returns 0 after
probe_8259A(). Use NR_IRQS_LEGACY instead.
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>