container/list: silence vet warnings

container/list/list_test.go:274: self-assignment of e1 to e1
container/list/list_test.go:274: self-assignment of e4 to e4
container/list/list_test.go:282: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e4 to e4

Updates #11041

Change-Id: Ibd90cf6a924e93497908f437b814c3fc82937f4a
Reviewed-on: https://go-review.googlesource.com/27114
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/src/container/list/list_test.go b/src/container/list/list_test.go
index e3bfe53..99e006f 100644
--- a/src/container/list/list_test.go
+++ b/src/container/list/list_test.go
@@ -271,7 +271,7 @@
 
 	l.MoveBefore(e2, e4)
 	checkListPointers(t, l, []*Element{e1, e3, e2, e4})
-	e1, e2, e3, e4 = e1, e3, e2, e4
+	e2, e3 = e3, e2
 
 	l.MoveBefore(e4, e1)
 	checkListPointers(t, l, []*Element{e4, e1, e2, e3})
@@ -279,11 +279,11 @@
 
 	l.MoveAfter(e4, e1)
 	checkListPointers(t, l, []*Element{e1, e4, e2, e3})
-	e1, e2, e3, e4 = e1, e4, e2, e3
+	e2, e3, e4 = e4, e2, e3
 
 	l.MoveAfter(e2, e3)
 	checkListPointers(t, l, []*Element{e1, e3, e2, e4})
-	e1, e2, e3, e4 = e1, e3, e2, e4
+	e2, e3 = e3, e2
 }
 
 // Test PushFront, PushBack, PushFrontList, PushBackList with uninitialized List