staging: r8188eu: remove duplicate assignment

netdev_alloc_skb() has assigned ssi->netdev to skb->dev if successed,
no need to repeat assignment.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1648728514-37390-1-git-send-email-wangqing@vivo.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>