clippy: needless_borrow

warning: this expression creates a reference which is immediately dereferenced by the compiler
   --> src/cmd/excel.rs:630:76
    |
630 |                         DataType::DateTimeIso(ref dt) => record.push_field(&dt),
    |                                                                            ^^^ help: change this to: `dt`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
    = note: `#[warn(clippy::needless_borrow)]` on by default

warning: this expression creates a reference which is immediately dereferenced by the compiler
   --> src/cmd/excel.rs:631:75
    |
631 |                         DataType::DurationIso(ref d) => record.push_field(&d),
    |                                                                           ^^ help: change this to: `d`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

warning: `qsv` (bin "qsv") generated 2 warnings (run `cargo clippy --fix --bin "qsv"` to apply 2 suggestions)

src/cmd/excel.rs

@@ -627,8 +627,8 @@ pub fn run(argv: &[&str]) -> CliResult<()> {
                         DataType::Bool(ref b) => {
                             record.push_field(if *b { "true" } else { "false" })
                         },
-                        DataType::DateTimeIso(ref dt) => record.push_field(&dt),
-                        DataType::DurationIso(ref d) => record.push_field(&d),
+                        DataType::DateTimeIso(ref dt) => record.push_field(dt),
+                        DataType::DurationIso(ref d) => record.push_field(d),
                         DataType::Duration(ref d) => record.push_field(ryu_buffer.format(*d)),
                     };