[C++11] Use 'nullptr'.

llvm-svn: 210442
diff --git a/llvm/unittests/Support/DataExtractorTest.cpp b/llvm/unittests/Support/DataExtractorTest.cpp
index ec8bd3d..81de983 100644
--- a/llvm/unittests/Support/DataExtractorTest.cpp
+++ b/llvm/unittests/Support/DataExtractorTest.cpp
@@ -94,7 +94,7 @@
 
   EXPECT_EQ(stringData, DE.getCStr(&offset));
   EXPECT_EQ(11U, offset);
-  EXPECT_EQ(NULL, DE.getCStr(&offset));
+  EXPECT_EQ(nullptr, DE.getCStr(&offset));
   EXPECT_EQ(11U, offset);
 }