qcacmn: Fix a locking issue in DP Tx error path

There is a possiblility of invoking spin_unlock without taking
spin_lock in DP tx descriptor prepare function in error path.
This change fixes this issue.

Change-Id: Id4c5c0115b14041865e7f97f930e7023e865eca2
CRs-Fixed: 2088616
1 file changed