staging: r8188eu: Use skb_put_data() instead of skb_put/memcpy pair

Use skb_put_data() instead of skb_put() and memcpy(), which is shorter
and clear. Drop the tmp variable that is not needed any more.

Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Link: https://lore.kernel.org/r/20220927024050.13556-1-shangxiaojing@huawei.com


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