Fix warning about RegionStoreManager::Retrieve() not always returning a value.

llvm-svn: 59571
diff --git a/clang/lib/Analysis/RegionStore.cpp b/clang/lib/Analysis/RegionStore.cpp
index 6eba8bb..1831208 100644
--- a/clang/lib/Analysis/RegionStore.cpp
+++ b/clang/lib/Analysis/RegionStore.cpp
@@ -315,7 +315,7 @@
 
   default:
     assert(false && "Invalid Location");
-    break;
+    return L;
   }
 }