[Discuss-gnuradio] Patch for OptionParser backwards compatibility

[Michael Dickens]

Someone recently added a "--which" option to the usrp_fft example,  
that works correctly with the OptionParser provided in Python 2.4 or  
newer.  But for those using that provided with Python 2.3, it doesn't  
work.  Simple fix; here's the patch. - MLD

Index: gnuradio-examples/python/usrp/usrp_fft.py
===================================================================
--- gnuradio-examples/python/usrp/usrp_fft.py   (revision 6196)
+++ gnuradio-examples/python/usrp/usrp_fft.py   (working copy)
@@ -52,7 +52,7 @@
         self.panel = panel

         parser = OptionParser(option_class=eng_option)
-        parser.add_option("-w", "--which", type=int, default=0,
+        parser.add_option("-w", "--which", type="int", default=0,
                           help="select which USRP (0, 1, ...)  
default is %default",
                          metavar="NUM")
         parser.add_option("-R", "--rx-subdev-spec", type="subdev",  
default=None,