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Using kmemdup() helper function rather than implementing it again with kmalloc() + memcpy(), which improves the code readability. Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com> Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>