"End-of-Rib Marker" printed even when there are withdrawn routes

[fenner]

https://github.com/the-tcpdump-group/tcpdump/blob/dcf83034e06a18b69fe407ceac69715bf1abc2f6/print-bgp.c#L2770

withdrawn_routes_len is decremented while parsing the withdrawn routes, so if the withdrawn section is present but well-formed, withdrawn_routes_len will be zero.

[fxlb]

Thanks. Do you have a patch?