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Since debugfs_create_dir() returns ERR_PTR, IS_ERR() is enough to check whether the directory is successfully created. So remove the redundant NULL check. Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Link: https://lore.kernel.org/r/20230817073017.350002-1-ruanjinjie@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>