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rust: error: optimize error type to use nonzero
Optimize `Result<(), Error>` size by changing `Error` type to `NonZero*` for niche optimization. This reduces the space used by the `Result` type, as the `NonZero*` type enables the compiler to apply more efficient memory layout. For example, the `Result<(), Error>` changes size from 8 to 4 bytes. Link: #1120 Signed-off-by: Filipe Xavier <felipe_life@live.com> Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Fiona Behrens <me@kloenk.dev> Link: https://lore.kernel.org/r/BL0PR02MB4914B9B088865CF237731207E9732@BL0PR02MB4914.namprd02.prod.outlook.com [ Removed unneeded block around `match`, added backticks in panic message and added intra-doc link. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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