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WARN_ON() propagates the result of conditional expression, and it can be used to return early in the following expression in the arch_init_irq(). This is a no-op cleanup, except that compiler may optimize the error paths better because WARN_ON() implies 'unlikely()'. Signed-off-by: Yury Norov <yury.norov@gmail.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>