staging: rtl8723bs: Delete un-necessary return for _rtw_xmit_entry()

As _rtw_xmit_entry() would always return 0, we are save to delete the
return value for it.

Signed-off-by: GUO Zihua <guozihua@huawei.com>
Link: https://lore.kernel.org/r/20220909082048.14486-2-guozihua@huawei.com


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