Remove invalid double colon in test case was previously ignored by FileCheck.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164167 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenObjCXX/arc-references.mm

@@ -10,7 +10,7 @@ void callee();
 // CHECK: define void @_Z5test0v()
 void test0() {
   // CHECK: call i8* @_Z9getObjectv
-  // CHECK-NEXT:: call i8* @objc_retainAutoreleasedReturnValue
+  // CHECK-NEXT: call i8* @objc_retainAutoreleasedReturnValue
   const __strong id &ref1 = getObject();
   // CHECK: call void @_Z6calleev
   callee();