[C++11] Use 'nullptr'. Analysis edition.

llvm-svn: 209191
diff --git a/clang/lib/Analysis/ScanfFormatString.cpp b/clang/lib/Analysis/ScanfFormatString.cpp
index 32d35cd..ed28627 100644
--- a/clang/lib/Analysis/ScanfFormatString.cpp
+++ b/clang/lib/Analysis/ScanfFormatString.cpp
@@ -82,7 +82,7 @@
   
   using namespace clang::analyze_scanf;
   const char *I = Beg;
-  const char *Start = 0;
+  const char *Start = nullptr;
   UpdateOnReturn <const char*> UpdateBeg(Beg, I);
 
     // Look for a '%' character that indicates the start of a format specifier.