container/list: remove unnecessary code

Remove a unnecessary statement in the test function, the variables
aren't checked afterwards. Also remove return statements in helper
functions and remove the declaration that a the helper function return a
value. The return value isn't used in the current state of code

Change-Id: I5bc384104c1002c4138e0894938778ae9710ce4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/358714
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>

src/container/list/list.go

@@ -104,21 +104,20 @@ func (l *List) insertValue(v interface{}, at *Element) *Element {
 	return l.insert(&Element{Value: v}, at)
 }
 
-// remove removes e from its list, decrements l.len, and returns e.
-func (l *List) remove(e *Element) *Element {
+// remove removes e from its list, decrements l.len
+func (l *List) remove(e *Element) {
 	e.prev.next = e.next
 	e.next.prev = e.prev
 	e.next = nil // avoid memory leaks
 	e.prev = nil // avoid memory leaks
 	e.list = nil
 	l.len--
-	return e
 }
 
-// move moves e to next to at and returns e.
-func (l *List) move(e, at *Element) *Element {
+// move moves e to next to at.
+func (l *List) move(e, at *Element) {
 	if e == at {
-		return e
+		return
 	}
 	e.prev.next = e.next
 	e.next.prev = e.prev
@@ -127,8 +126,6 @@ func (l *List) move(e, at *Element) *Element {
 	e.next = at.next
 	e.prev.next = e
 	e.next.prev = e
-
-	return e
 }
 
 // Remove removes e from l if e is an element of list l.

src/container/list/list_test.go

@@ -283,7 +283,6 @@ func TestMove(t *testing.T) {
 
 	l.MoveAfter(e2, e3)
 	checkListPointers(t, l, []*Element{e1, e3, e2, e4})
-	e2, e3 = e3, e2
 }
 
 // Test PushFront, PushBack, PushFrontList, PushBackList with uninitialized List