Revert "usb: gadget: u_ether: Re-attach netif device to mirror detachment"

This reverts commit 76c945730cdffb572c7767073cc6515fd3f646b4.

Prerequisite revert for the reverting of the original commit f49449fbc21e.

Fixes: 76c945730cdf ("usb: gadget: u_ether: Re-attach netif device to mirror detachment")
Fixes: f49449fbc21e ("usb: gadget: u_ether: Replace netif_stop_queue with netif_device_detach")
Reported-by: Ferry Toth <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ferry Toth <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/gadget/function/u_ether.c

···
 		if (netif_running(dev->net))
 			eth_start(dev, GFP_ATOMIC);
 
-		netif_device_attach(dev->net);
-
 	/* on error, disable any endpoints  */
 	} else {
 		(void) usb_ep_disable(link->out_ep);