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Using `unwrap()` in kernel doctests can cause panics on error and may give newcomers the mistaken impression that panicking is acceptable in kernel code. Replace all `.unwrap()` calls in `kernel::list` examples with `.ok_or(EINVAL)?` so that errors are properly propagated. Suggested-by: Miguel Ojeda <ojeda@kernel.org> Link: https://github.com/Rust-for-Linux/linux/issues/1164 Reviewed-by: Benno Lossin <lossin@kernel.org> Signed-off-by: Albin Babu Varghese <albinbabuvarghese20@gmail.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20250527204928.5117-1-albinbabuvarghese20@gmail.com [ Reworded slightly. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>