Fixing cpplint readability/casting issues

Change-Id: I6821da0e23737995a9b884a04e9b63fac640cd05
diff --git a/compiler/llvm/runtime_support_builder.cc b/compiler/llvm/runtime_support_builder.cc
index 19ccc36..e6479e0 100644
--- a/compiler/llvm/runtime_support_builder.cc
+++ b/compiler/llvm/runtime_support_builder.cc
@@ -43,7 +43,7 @@
 #define GET_RUNTIME_SUPPORT_FUNC_DECL(ID, NAME) \
   do { \
     ::llvm::Function* fn = module_.getFunction(#NAME); \
-    DCHECK_NE(fn, (void*)NULL) << "Function not found: " << #NAME; \
+    DCHECK(fn != NULL) << "Function not found: " << #NAME; \
     runtime_support_func_decls_[runtime_support::ID] = fn; \
   } while (0);