Set the MTU for bonding device by calling .mtu_set for all
the slaves. Set the MTU only if all slaves support .mtu_set,
and there is no error returned from any slave.
Signed-off-by: Sharmila Podury <sharmila.podury@att.com>
Acked-by: Declan Doherty <declan.doherty@intel.com>
55b58a7374