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PR #5956 wasn't fully complete and still had some outstanding minor issues and cleanups to be done, as well as hidden semantic changes. This addresses a bunch of them: - Remove unnecessary `Error` mapping to `String` as `windows-rs`'s `Error` has a more complete `Display` representation by itself. - Remove `into_result()` as every call could have formatted the `windows-rs` `Error` in a log call directly. - Pass `None` instead of a pointer to an empty slice wherever possible (waiting for https://github.com/microsoft/win32metadata/pull/1971 to trickle down into `windows-rs`). - Remove `.clone()` on COM objects (temporarily increasing the refcount) when it can be avoided by inverting the order of operations on `raw` variables.