DrBotIRC: properly debug log welcome events

my git surgery failed me

DrBotIRC.py

@@ -138,10 +138,10 @@ class DrBotServerConnection(irclib.ServerConnection):
 
         """
 
-        log.debug("welcome: {0:s}".format(what))
-
         what = event.arguments()[0]
 
+        log.debug("welcome: {0:s}".format(what))
+
         match = re.search('(\S+!\S+@\S+)', what)
         if match:
             self.nickmask = match.group(1)