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/rpc/layout/graph_algo.rs

@@ -355,7 +355,7 @@ impl Graph<WeightedEdge> {
 
 		// Remark that the cycle in prev is in the reverse order compared to the cycle
 		// in the graph. Thus the .rev().
-		return cycles_prev
+		cycles_prev
 			.iter()
 			.map(|cycle| {
 				cycle
@@ -364,7 +364,7 @@ impl Graph<WeightedEdge> {
 					.map(|id| self.id_to_vertex[*id])
 					.collect()
 			})
-			.collect();
+			.collect()
 	}
 }
 

src/rpc/layout/history.rs

@@ -10,7 +10,7 @@ use crate::replication_mode::*;
 
 impl LayoutHistory {
 	pub fn new(replication_factor: ReplicationFactor) -> Self {
-		let version = LayoutVersion::new(replication_factor.into());
+		let version = LayoutVersion::new(replication_factor);
 
 		let staging = LayoutStaging {
 			parameters: Lww::<LayoutParameters>::new(version.parameters),

src/rpc/layout/test.rs

@@ -77,7 +77,7 @@ fn check_against_naive(cl: &LayoutVersion) -> Result<bool, Error> {
 		}
 	}
 
-	return Ok(false);
+	Ok(false)
 }
 
 fn show_msg(msg: &Message) {