style: Remove unneeded return statement

[caspermeijn]

This solves clippy warnings like this:

error: unneeded `return` statement
   --> src/common.rs:226:5
    |
226 |     return Ok(result);
    |     ^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
    = note: `-D clippy::needless-return` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::needless_return)]`
help: remove `return`
    |
226 -     return Ok(result);
226 +     Ok(result)
    |