selftests: bonding: remove redundant delete action of device link1_1

When run command "ip netns delete client", device link1_1 has been
deleted. So, it is no need to delete link1_1 again. Remove it.
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/bonding/bond-arp-interval-causes-panic.sh

@@ -11,7 +11,6 @@ finish()
 {
 	ip netns delete server || true
 	ip netns delete client || true
-	ip link del link1_1 || true
 }
 
 trap finish EXIT