At end of program there is call to rte_free() which is passing
a bogus value. There is no "bpf_filter" defined in this application;
it ends up being a text address inside pcap library.
Fixes: cbb44143be74 ("app/dumpcap: add new packet capture application")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>