Remove unused variables.

llvm-svn: 147260
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 62c557a..10ec6be 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -2406,7 +2406,7 @@
   if (Out.has_error())
     return CXSaveError_Unknown;
 
-  if (llvm::error_code ec = llvm::sys::fs::rename(TempPath.str(), File)) {
+  if (llvm::sys::fs::rename(TempPath.str(), File)) {
     bool exists;
     llvm::sys::fs::remove(TempPath.str(), exists);
     return CXSaveError_Unknown;