Fix linting related issues

src/gas/validation.rs

@@ -154,7 +154,6 @@ fn build_control_flow_graph(
 	graph.set_first_instr_pos(entry_node_id, 0);
 
 	let mut stack = vec![ControlFrame::new(entry_node_id, terminal_node_id, false)];
-
 	let mut metered_blocks_iter = blocks.iter().peekable();
 	for (cursor, instruction) in body.code().elements().iter().enumerate() {
 		let active_node_id = stack

src/pack.rs

@@ -251,7 +251,6 @@ pub fn pack_instance(
 #[cfg(test)]
 mod test {
 	use super::{super::optimize, *};
-	use parity_wasm::builder;
 
 	fn test_packer(mut module: elements::Module, target_runtime: &TargetRuntime) {
 		let mut ctor_module = module.clone();

src/stack_height/max_height.rs

@@ -506,7 +506,7 @@ mod tests {
 )
 "#;
 		let module = elements::deserialize_buffer(
-			&wabt::Wat2Wasm::new()
+			wabt::Wat2Wasm::new()
 				.validate(false)
 				.convert(SOURCE)
 				.expect("Failed to wat2wasm")