Fix typo in assertion message.  Reported by Shriramana Sharma.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@184691 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/list b/include/list
index c6000c9..8f80848 100644
--- a/include/list
+++ b/include/list
@@ -1600,7 +1600,7 @@
 void
 list<_Tp, _Alloc>::pop_back()
 {
-    _LIBCPP_ASSERT(!empty(), "list::pop_front() called with empty list");
+    _LIBCPP_ASSERT(!empty(), "list::pop_back() called with empty list");
     __node_allocator& __na = base::__node_alloc();
     __node& __n = *base::__end_.__prev_;
     base::__unlink_nodes(__n, __n);