chore: remove various useless code

- call expect directly on Result
lint message: called `ok().expect()` on a `Result` value
help: you can call `expect()` directly on the `Result`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#ok_expect
- use assign operation instead of manual implementation
lint message: manual implementation of an assign operation
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#assign_op_pattern
- remove useless call to format
lint message: useless use of `format!`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#useless_format
- remove useless `?Sized`
lint message: `?Sized` bound is ignored because of a `Sized` requirement
note: ...because `Deserialize` has the bound `Sized`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#needless_maybe_sized
- use is_some instead of pattern maching with Some(_)
lint message: redundant pattern matching, consider using `is_some()`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#redundant_pattern_matching
- remove unneeded unit return type
lint message: unneeded unit return type
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#unused_unit
- remove redundant closure
lint message: redundant closure
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#redundant_closure
- use derive Default instead of manual implementation
lint message: this `impl` can be derived
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#derivable_impls
- remove unneeded `return` statement
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#needless_return
- remove empty string from println call
lint message: empty string literal in `println!`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#println_empty_string
- remove clone() on type than implement Copy
lint message: using `clone` on type `Option<ChecksumValue>` which implements the `Copy` trait
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#clone_on_copy
- remove useless let binding
lint message: this let-binding has unit value
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#let_unit_value
- remove useless len comparison to zero, already test of empty
lint message: length comparison to zero
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#len_zero
- remove useless `as_deref` call
lint message: derefed type is same as origin
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#needless_option_as_deref
- remove useless conversion of the same type
lint message: useless conversion to the same type: `replication_mode::ReplicationFactor`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#useless_conversion
- remove useless bool_comparison
lint message: equality checks against false can be replaced by a negation
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#bool_comparison
- remove useless to_string
lint message: unnecessary use of `to_string`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#unnecessary_to_owned

Signed-off-by: Gwen Lg <me@gwenlg.fr>

src/net/bytes_buf.rs

@@ -130,7 +130,7 @@ impl BytesBuf {
 	/// Return the content as a stream of individual chunks
 	pub fn into_stream(self) -> ByteStream {
 		use futures::stream::StreamExt;
-		Box::pin(futures::stream::iter(self.buf).map(|x| Ok(x)))
+		Box::pin(futures::stream::iter(self.buf).map(Ok))
 	}
 }
 
@@ -161,7 +161,6 @@ mod test {
 	#[test]
 	fn test_bytes_buf() {
 		let mut buf = BytesBuf::new();
-		assert!(buf.len() == 0);
 		assert!(buf.is_empty());
 
 		buf.extend(Bytes::from(b"Hello, world!".to_vec()));
@@ -176,7 +175,6 @@ mod test {
 			buf.take_all(),
 			Bytes::from(b"Hello, world!1234567890".to_vec())
 		);
-		assert!(buf.len() == 0);
 		assert!(buf.is_empty());
 
 		buf.extend(Bytes::from(b"1234567890".to_vec()));
@@ -193,7 +191,6 @@ mod test {
 			buf.take_exact(11),
 			Some(Bytes::from(b"llo, world!".to_vec()))
 		);
-		assert!(buf.len() == 0);
 		assert!(buf.is_empty());
 	}
 }