bitbake: msg: Drop unused local variable

(Bitbake rev: 140929b404ee1e2f5e0e1a3a1d3aa49fb3759ade)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/msg.py

@@ -133,7 +133,6 @@ class LogFilterShowOnce(logging.Filter):
         self.seen_errors = set()
 
     def filter(self, record):
-        msg = record.msg
         if record.levelno == bb.msg.BBLogFormatter.WARNONCE:
             if record.msg in self.seen_warnings:
                 return False