Switch to using C++ style casts.

llvm-svn: 198505
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 634b9dd76812ff2222c779b842ec32c7a035c850
diff --git a/src/new.cpp b/src/new.cpp
index f4998cf..3b7c341 100644
--- a/src/new.cpp
+++ b/src/new.cpp
@@ -167,7 +167,7 @@
 new_handler
 get_new_handler() _NOEXCEPT
 {
-    return __sync_fetch_and_add(&__new_handler, (new_handler)0);
+    return __sync_fetch_and_add(&__new_handler, nullptr);
 }
 
 #endif // !__GLIBCXX__