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Since the debugfs_create_dir() never returns a null pointer, checking the return value for a null pointer is redundant, and using IS_ERR is safe enough. Signed-off-by: Li Zetao <lizetao1@huawei.com> Link: https://patch.msgid.link/20240903143343.2004652-1-lizetao1@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>