Fix bugs introduced in

9c62ce83
usb: gadget: ether: convert to new interface of f_ecm

94b5573e
usb: gadget: ether: convert to new interface of f_eem

8af5232d
usb: gadget: ether: convert to new interface of f_subset

9bd4a10e
usb: gadget: ether: convert to new interface of f_rndis
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>