[C++11] Use 'nullptr'.

llvm-svn: 208392
diff --git a/clang/lib/Edit/EditedSource.cpp b/clang/lib/Edit/EditedSource.cpp
index 8fa2ee5..6cf6335 100644
--- a/clang/lib/Edit/EditedSource.cpp
+++ b/clang/lib/Edit/EditedSource.cpp
@@ -158,7 +158,7 @@
   }
 
   FileOffset TopBegin, TopEnd;
-  FileEdit *TopFA = 0;
+  FileEdit *TopFA = nullptr;
 
   if (I == FileEdits.end()) {
     FileEditsTy::iterator