File fix-serious-compile-warning.patch of Package gpsim

diff --git a/src/interface.cc b/src/interface.cc
index d00a5c4..d13e595 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -321,7 +321,7 @@ static void *run_thread( void *ptr )
     g_mutex_unlock(muRunMutex);
 
   }
-
+  return 0;
 }