selftests, bpf: test_tc_tunnel.sh nc: Cannot use -p and -l

When run test_tc_tunnel.sh, it complains following error

ipip
encap 192.168.1.1 to 192.168.1.2, type ipip, mac none len 100
test basic connectivity
nc: cannot use -p and -l

nc man page has:

-l Listen for an incoming connection rather than initiating
a connection to a remote host.Cannot be used together with
any of the options -psxz. Additionally, any timeouts specified
with the -w option are ignored.

Correct nc in server_listen().

Signed-off-by: Vincent Li <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Acked-by: Martin KaFai Lau <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/test_tc_tunnel.sh

···
 }
 
 server_listen() {
-	ip netns exec "${ns2}" nc "${netcat_opt}" -l -p "${port}" > "${outfile}" &
+	ip netns exec "${ns2}" nc "${netcat_opt}" -l "${port}" > "${outfile}" &
 	server_pid=$!
 	sleep 0.2
 }