Fixed bug in GREndPathNodeBuilder: only return a node if it wasn't in the node cache.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49907 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/CFRefCount.cpp b/lib/Analysis/CFRefCount.cpp
index 1c2f20a..1618f04 100644
--- a/lib/Analysis/CFRefCount.cpp
+++ b/lib/Analysis/CFRefCount.cpp
@@ -1065,6 +1065,10 @@
   }
       
   ExplodedNode<ValueState>* N = Builder.MakeNode(St);  
+  
+  if (!N)
+    return;
+  
   std::vector<SymbolID>*& LeaksAtNode = Leaks[N];
   assert (!LeaksAtNode);
   LeaksAtNode = new std::vector<SymbolID>();