Examples produce clippy warnings

[Nemo157]

Bug Report

Current Behavior

Examples currently output warnings when checked with clippy:

warning: this let-binding has unit value. Consider omitting `let msg =`
  --> examples/src/body_types.rs:30:5
   |
30 |     let msg = cx.body_json().await.client_err()?;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> examples/src/lib.rs:2:9
   |
2  | #![warn(clippy::all)]
   |         ^^^^^^^^^^^
   = note: #[warn(clippy::let_unit_value)] implied by #[warn(clippy::all)]
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value

warning: passing a unit value to a function
  --> examples/src/body_types.rs:32:23
   |
32 |     Ok(response::json(msg))
   |                       ^^^
   |
note: lint level defined here
  --> examples/src/lib.rs:2:9
   |
2  | #![warn(clippy::all)]
   |         ^^^^^^^^^^^
   = note: #[warn(clippy::unit_arg)] implied by #[warn(clippy::all)]
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
help: if you intended to pass a unit value, use a unit literal instead
   |
32 |     Ok(response::json(()))
   |                       ^^

warning: this let-binding has unit value. Consider omitting `let msg =`
  --> examples/src/body_types.rs:37:5
   |
37 |     let msg = cx.body_form().await?;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value

warning: passing a unit value to a function
  --> examples/src/body_types.rs:39:20
   |
39 |     Ok(forms::form(msg))
   |                    ^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
help: if you intended to pass a unit value, use a unit literal instead
   |
39 |     Ok(forms::form(()))
   |                    ^^

Expected behavior/code

High quality warning free code.

Additional context/Screenshots

#228 excludes the examples from being run under clippy in CI, once the warnings have been fixed they can be included back into the clippy build.

[Nemo157]

Fixed by #249