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"List::is_empty()" provides a straight forward convention to check whether a given "List" is empty or not. There're numerous places in the current implementation still use "self.first.is_null()" to perform the equivalent check, replace them with "List::is_empty()". Signed-off-by: I Hsin Cheng <richard120310@gmail.com> Link: https://lore.kernel.org/r/20250310073853.427954-1-richard120310@gmail.com Reviewed-by: Benno Lossin <lossin@kernel.org> [ Rebased dropping the cases that do not apply anymore. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>