tests ~ (sub-crate/od) fix cargo clippy complaints (unused imports)

src/uu/od/src/mockstream.rs

@@ -1,6 +1,5 @@
 // https://github.com/lazy-bitfield/rust-mockstream/pull/2
 
-use std::error::Error as errorError;
 use std::io::{Cursor, Error, ErrorKind, Read, Result};
 
 /// `FailingMockStream` mocks a stream which will fail upon read or write

src/uu/od/src/partialreader.rs

@@ -77,7 +77,6 @@ impl<R: HasError> HasError for PartialReader<R> {
 mod tests {
     use super::*;
     use mockstream::*;
-    use std::error::Error;
     use std::io::{Cursor, ErrorKind, Read};
 
     #[test]