Fix a warning. [-Wunused-variable]

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184284 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 18c56b0..3298d5a 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -723,9 +723,9 @@
     SetLLVMFunctionAttributes(FD, getTypes().arrangeGlobalDeclaration(GD), F);
 
   if (getCXXABI().HasThisReturn(GD)) {
-    llvm::Type *RetTy = F->getReturnType();
     assert(!F->arg_empty() &&
-           F->arg_begin()->getType()->canLosslesslyBitCastTo(RetTy) &&
+           F->arg_begin()->getType()
+             ->canLosslesslyBitCastTo(F->getReturnType()) &&
            "unexpected this return");
     F->addAttribute(1, llvm::Attribute::Returned);
   }