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debugfs_create_dir() and debugfs_create_file() returns NULL on error or a pointer on success. They do not return the error value with ERR_PTR. So we should not check the return with IS_ERR_OR_NULL, instead we should just check for NULL. Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>