selftests: bonding: delete unnecessary line

"ip link set dev "$devbond1" nomaster"
This line code in bond-eth-type-change.sh is unnecessary.
Because $devbond1 was not added to any master device.

Signed-off-by: Liang Li <liali@redhat.com>
Acked-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Liang Li

tools/testing/selftests/drivers/net/bonding/bond-eth-type-change.sh

@@ -53,7 +53,6 @@ bond_test_enslave_type_change()
 	# restore ARPHRD_ETHER type by enslaving such device
 	ip link set dev "$devbond2" master "$devbond0"
 	check_err $? "could not enslave $devbond2 to $devbond0"
-	ip link set dev "$devbond1" nomaster
 
 	bond_check_flags "$devbond0"