genirq: Check __free_irq() return value for NULL
__free_irq() can return a NULL irqaction for example when trying to free already-free IRQ, but the callsite unconditionally dereferences the returned pointer. Fix this by adding a check and return NULL. Signed-off-by: NAlexandru Moise <00moses.alexander00@gmail.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20170919200412.GA29985@gmail.com
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