genirq: Remove redundant NULL check of irq_desc
for_each_irq_desc() macro has already skipped NULL irq_desc, don't bother to check it again. Signed-off-by: NJianyu Zhan <nasa4836@gmail.com> Cc: mingo@kernel.org Cc: yhlu.kernel@gmail.com Link: http://lkml.kernel.org/r/1458395959-7046-1-git-send-email-nasa4836@gmail.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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