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of_iomap() may return NULL, so we need check the return value. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Michael Walle <michael@walle.cc> Signed-off-by: Shawn Guo <shawnguo@kernel.org>