MC: Fix whitespace error from last commit.

A Visual C++ extension that removes trailing new lines? Seriously?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109390 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/WinCOFFObjectWriter.cpp

@@ -728,4 +728,4 @@ namespace llvm {
   MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS) {
     return new WinCOFFObjectWriter(OS);
   }
-}
+}