[stephan k.] fix a typo

src/chat.py

@@ -623,7 +623,7 @@ class Chat:
 			elif event.keyval == gtk.keysyms.l or \
 				event.keyval == gtk.keysyms.L: # CTRL + L
 				jid = self.get_active_jid()
-				message_textview = self.xmls[jid].get_widget('message_textview')
+				conversation_textview = self.xmls[jid].get_widget('conversation_textview')
 				conversation_textview.get_buffer().set_text('')
 			elif event.keyval == gtk.keysyms.v: # CTRL + V
 				jid = self.get_active_jid()