Fix NSLog format string checking for %@.

llvm-svn: 148885
diff --git a/clang/lib/Analysis/FormatString.cpp b/clang/lib/Analysis/FormatString.cpp
index a4d97fd..a0633c8 100644
--- a/clang/lib/Analysis/FormatString.cpp
+++ b/clang/lib/Analysis/FormatString.cpp
@@ -337,7 +337,8 @@
         argTy->isNullPtrType();
 
     case ObjCPointerTy:
-      return argTy->getAs<ObjCObjectPointerType>() != NULL;
+      return argTy->getAs<ObjCObjectPointerType>() ||
+             argTy->getAs<BlockPointerType>();
   }
 
   llvm_unreachable("Invalid ArgTypeResult Kind!");