[patch] libstdc++/64168 fix return statement

[Jonathan Wakely]

I've really got to start testing with -Wsystem-headers so I don't do
silly things like this.

Committed as obvious.

commit 88abdc37b00dbe64099f78a31163a299a023ec03
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Dec 3 16:08:08 2014 +0000

    	PR libstdc++/64168
    	* include/std/future (_Deferred_state::_M_has_deferred): Fix return.

diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index 60c2e4e..157ceb3 100644
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -1606,7 +1606,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       // Caller should check whether the state is ready first, because this
       // function will return true even after the deferred function has run.
-      virtual bool _M_has_deferred() const { true; }
+      virtual bool _M_has_deferred() const { return true; }
     };
 
   // Common functionality hoisted out of the _Async_state_impl template.