Fixed infinite recursion in ASN1 BER codec

scapy/asn1/ber.py

@@ -233,7 +233,7 @@ class BERcodec_NULL(BERcodec_INTEGER):
         if i == 0:
             return chr(cls.tag)+"\0"
         else:
-            return super(cls,cls).enc(i)
+            return BERcodec_INTEGER.enc(i)
 
 class BERcodec_SEP(BERcodec_NULL):
     tag = ASN1_Class_UNIVERSAL.SEP