pc: Drop useless test from isa_irq_handler
IsaIrqState::ioapic is always non-NULL. Probably, the concrete qemu_irq was supposed to be tested, but that's already done by qemu_set_irq. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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