Cleanup whitespace in <variant>. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@366026 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/variant b/include/variant
index 21871ae..88a625d 100644
--- a/include/variant
+++ b/include/variant
@@ -1089,14 +1089,6 @@
   }
 };
 
-template <class... _Types>
-struct __overload;
-
-template <>
-struct __overload<> { void operator()() const; };
-
-
-
 struct __no_narrowing_check {
   template <class _Dest, class _Source>
   using _Apply = __identity<_Dest>;
@@ -1120,14 +1112,18 @@
     >::template _Apply<_Dest, _Source>;
 
 
+template <class... _Types>
+struct __overload;
+
+template <>
+struct __overload<> { void operator()() const; };
+
 template <class _Tp, class... _Types>
 struct __overload<_Tp, _Types...> : __overload<_Types...> {
   using __overload<_Types...>::operator();
 
   template <class _Up>
-  auto operator()(_Tp, _Up&&) const ->
-
-  __check_for_narrowing<_Tp, _Up>;
+  auto operator()(_Tp, _Up&&) const -> __check_for_narrowing<_Tp, _Up>;
 };
 
 template <class _Base, class _Tp>