device: do not set MAC address on iface with index <=0
device: do not set MAC address on iface with index <=0
The nm_device_hw_addr_reset()
should only set MAC address on NIC
with valid(>0) interface index.
The failure was found by ovs_mtu
test of NMCI, failed to reproduce
the original problem (ovs_mtu
test of NMCI) with 100 times retry.
And no trace log found for original test failure, hence cannot tell why
nm_device_hw_addr_reset()
been invoked with iface index 0.