Enable -Wnull-conversion for non-integral target types (eg: double).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158744 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/FixIt/fixit.cpp b/test/FixIt/fixit.cpp
index 68ede1e..3eac434 100644
--- a/test/FixIt/fixit.cpp
+++ b/test/FixIt/fixit.cpp
@@ -219,6 +219,7 @@
 
 #define NULL __null
 char c = NULL; // expected-warning {{implicit conversion of NULL constant to 'char'}}
+double dbl = NULL; // expected-warning {{implicit conversion of NULL constant to 'double'}}
 
 namespace arrow_suggest {