usb: gadget: f_ncm: remove check for NULL skb_tx_data in timer function

This condition is already checked for in ncm_wrap_ntb(),
except that that check is done with eth_dev->lock held
(it is grabbed by eth_start_xmit).

It's best to not be reaching into ncm struct without locks held.

Cc: Brooke Basile <[email protected]>
Cc: "Bryan O'Donoghue" <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Lorenzo Colitti <[email protected]>
Signed-off-by: Maciej Żenczykowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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