Fix: Do not hang, while reading banner.

ssh-audit.py

@@ -415,6 +415,7 @@ class SSH(object):
 			if self.__state < self.SM_BANNER_SENT:
 				self.send_banner()
 			while self.__banner is None:
+				if not s > 0:
 					s, e = self.recv()
 					if s < 0:
 						break