Clean up clippy.

src/func/register.rs

@@ -56,7 +56,7 @@ pub fn by_value<T: Variant + Clone>(data: &mut Dynamic) -> T {
 
     // We consume the argument and then replace it with () - the argument is not supposed to be used again.
     // This way, we avoid having to clone the argument again, because it is already a clone when passed here.
-    return mem::take(data).cast::<T>();
+    mem::take(data).cast::<T>()
 }
 
 /// Trait to register custom Rust functions.