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由 Bin Meng 提交于
If pirq_routing_table points to NULL, that means U-Boot fails to generate the table before in create_pirq_routing_table(), so we test it against NULL before actually writing it. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Acked-by: NSimon Glass <sjg@chromium.org>
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