Correct clippy warnings

Currently intended to be done with:
cargo clippy --features "recommended merlin batch serialize experimental 
ed25519 ristretto p256 secp256k1 multisig" -- -A clippy::type_complexity 
-A dead_code

substrate/node/src/chain_spec.rs

@@ -32,7 +32,7 @@ fn testnet_genesis(wasm_binary: &[u8], endowed_accounts: Vec<AccountId>) -> Gene
 }
 
 pub fn development_config() -> Result<ChainSpec, &'static str> {
-  let wasm_binary = WASM_BINARY.ok_or_else(|| "Development wasm not available")?;
+  let wasm_binary = WASM_BINARY.ok_or("Development wasm not available")?;
 
   Ok(ChainSpec::from_genesis(
     // Name

substrate/node/src/command_helper.rs

@@ -62,7 +62,7 @@ pub fn create_benchmark_extrinsic(
     sp_runtime::AccountId32::from(sender.public()).into(),
     runtime::Signature::Sr25519(
       runtime::SignedPayload::from_raw(
-        call.clone(),
+        call,
         extra.clone(),
         (
           (),

substrate/node/src/rpc.rs

@@ -41,7 +41,7 @@ where
   let mut module = RpcModule::new(());
   let FullDeps { client, pool, deny_unsafe } = deps;
 
-  module.merge(System::new(client.clone(), pool.clone(), deny_unsafe).into_rpc())?;
+  module.merge(System::new(client.clone(), pool, deny_unsafe).into_rpc())?;
   module.merge(TransactionPayment::new(client.clone()).into_rpc())?;
   module.merge(Contracts::new(client).into_rpc())?;