There is no std::errc::success, remove the llvm one.

llvm-svn: 209960

llvm/tools/llvm-readobj/Error.cpp

@@ -50,7 +50,7 @@ std::string _readobj_error_category::message(int ev) const {
 
 error_condition _readobj_error_category::default_error_condition(int ev) const {
   if (ev == readobj_error::success)
-    return errc::success;
+    return error_condition();
   return errc::invalid_argument;
 }