rust_binder: clean clippy::mem_replace_with_default warning

Clippy reports:

    error: replacing a value of type `T` with `T::default()` is better expressed using `core::mem::take`
       --> drivers/android/binder/node.rs:690:32
        |
    690 |             _unused_capacity = mem::replace(&mut inner.freeze_list, KVVec::new());
        |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `core::mem::take(&mut inner.freeze_list)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#mem_replace_with_default
        = note: `-D clippy::mem-replace-with-default` implied by `-D warnings`
        = help: to override `-D warnings` add `#[allow(clippy::mem_replace_with_default)]`

The suggestion seems fine, thus apply it.

Signed-off-by: Miguel Ojeda <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: ojeda

drivers/android/binder/node.rs

@@ -687,7 +687,7 @@ impl Node {
             );
         }
         if inner.freeze_list.is_empty() {
-            _unused_capacity = mem::replace(&mut inner.freeze_list, KVVec::new());
+            _unused_capacity = mem::take(&mut inner.freeze_list);
         }
     }