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Make sure the interrupt is allocated correctly by lguest_setup_irq (check the return value of irq_alloc_desc_at for -ENOMEM) Signed-off-by: Stratos Psomadakis <psomas@cslab.ece.ntua.gr> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cleanups and commentry)