staging: rtl8723au: core: rtw_recv: use list_first_entry()

Use list_first_entry() instead of container_of() to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Acked-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>