break on padding opt

Author: brentru

adafruit_wiznet5k/adafruit_wiznet5k_dhcp.py

@@ -313,6 +313,8 @@ def parse_dhcp_response(self, response_timeout): # pylint: disable=too-many-bran
                 ptr += 1
                 self._t2 = int.from_bytes(_BUFF[ptr:ptr+opt_len], 'l')
                 ptr += opt_len
+            elif _BUFF[ptr] == 0:
+                break
             else:
                 # We're not interested in this option
                 ptr += 1