qcacmn: fix peer ref counter unexpected increasement

Host will drop the RX data that introduced in change
"add counters for sa_idx invalid issue", the related peer
has done ref_cnt + 1, but there is no peer ref_cnt -1 accordingly.
peer ref_cnt increase unexpected, panic happened when rmmod at last.

add the peer ref_cnt decrease operation.

Change-Id: Ie6bc5b57560a93c5f21431838b7bcb1140abfec5
CRs-Fixed: 2454468
1 file changed