misc: modem_if: link_mipi: use tx length for return before calling work queue

while running work queue or delayed work queue, skb->len might be removed.
so there could be a case that driver returns wrong return value to iodevice and rild.
it need to be saved before calling work queue to return proper value in send func.

bug: 6281406
Change-Id: If4106276720f9de70c1acc1b6fa834d02e025416
Signed-off-by: wonhee <wonhee48.seo@samsung.com>
1 file changed