dtrace backend: add function to reserved words

Signed-off-by: NAlon Levy <alevy@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@gmail.com>

scripts/tracetool/backend/dtrace.py

@@ -87,7 +87,7 @@ def stap(events):
         if len(e.args) > 0:
             for name in e.args.names():
                 # Append underscore to reserved keywords
-                if name in ('limit', 'in', 'next', 'self'):
+                if name in ('limit', 'in', 'next', 'self', 'function'):
                     name += '_'
                 out('  %s = $arg%d;' % (name, i))
                 i += 1