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Use memdup_user_nul() helper instead of open-coding to simplify the code. Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Reviewed-by: Bjorn Andersson <quic_bjorande@quicinc.com> Patchwork: https://patchwork.freedesktop.org/patch/552130/ Signed-off-by: Rob Clark <robdclark@chromium.org>