Fix this impl


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29055 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Win32.h b/lib/System/Win32/Win32.h
index d102991..ef2d66f 100644
--- a/lib/System/Win32/Win32.h
+++ b/lib/System/Win32/Win32.h
@@ -25,7 +25,7 @@
 #include <string>
 
 inline bool GetError(const std::string &Prefix, std::string *Dest) {
-  if (Dest == 0) return;
+  if (Dest == 0) return true;
   char *buffer = NULL;
   FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,
       NULL, GetLastError(), 0, (LPSTR)&buffer, 1, NULL);