update BIER scapy patch to match the scapy repo PR
@@ -3,7 +3,7 @@ new file mode 100644
index 0000000..e173cdb
--- /dev/null
+++ b/scapy/contrib/bier.py
-@@ -0,0 +1,58 @@
+@@ -0,0 +1,56 @@
+# http://trac.secdev.org/scapy/ticket/31
+
+# scapy.contrib.description = BIER
@@ -38,9 +38,6 @@ index 0000000..e173cdb
+ BitField("s", 1, 1),
+ ByteField("ttl", 0)]
+
-+ def guess_payload_class(self, payload):
-+ return BIER
-+
+
+class BIER(Packet):
+ name = "BIER"
@@ -62,3 +59,4 @@ index 0000000..e173cdb
+bind_layers(BIER, IP, Proto=4)
+bind_layers(BIER, IPv6, Proto=5)
+bind_layers(UDP, BIFT, dport=8138)
++bind_layers(BIFT, BIER)
