qcacmn: Fix SSR nbuf unmap issue

During SSR test, TX skb sent to target will not get TX completion,
so skb unmap and free is missed. later when driver is unloaded,
nbuf unmap leak is detected then panic happened.
Take care to unmap and free the corresponding skb of pending TX
descriptor during vdev detach.

Change-Id: I9f4e6443682097ec76632c96a0188ffa2c1a5fcc
CRs-Fixed: 2347770
1 file changed