Ignore execfile() return value; reported by Neal Norwitz.
diff --git a/Lib/rexec.py b/Lib/rexec.py
index cece544..411fcc5 100644
--- a/Lib/rexec.py
+++ b/Lib/rexec.py
@@ -259,7 +259,7 @@
 
     def r_execfile(self, file):
         m = self.add_module('__main__')
-        return execfile(file, m.__dict__)
+        execfile(file, m.__dict__)
 
     def r_import(self, mname, globals={}, locals={}, fromlist=[]):
         return self.importer.import_module(mname, globals, locals, fromlist)