libclang: type safety for CXTranslationUnitImpl::CIdx

llvm-svn: 173590
diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index 4a51e32..6f01a0b 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -759,7 +759,7 @@
   if (!client_index_callbacks || index_callbacks_size == 0)
     return;
 
-  CIndexer *CXXIdx = (CIndexer*)TU->CIdx;
+  CIndexer *CXXIdx = TU->CIdx;
   if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForIndexing))
     setThreadBackgroundPriority();