qcacmn: Fix WMI command stuck issue

There is race condition in HTCTrySend() where it is
clearing TxProcessCount after releasing target lock
which is resulting it in WMI command stuck as other
thread check TxProcessCount and returns after
putting command in queue.
Fix above race condition by unlocking target lock
after clearing TxProcessCount.

Change-Id: I80d69bf583d3eb3c9800c69d7917921aa959f866
CRs-Fixed: 991142

htc/htc_send.c

@@ -1042,8 +1042,7 @@ static HTC_SEND_QUEUE_RESULT htc_try_send(HTC_TARGET *target,
 	}
 
 	/* increment tx processing count on entry */
-	qdf_atomic_inc(&pEndpoint->TxProcessCount);
-	if (qdf_atomic_read(&pEndpoint->TxProcessCount) > 1) {
+	if (qdf_atomic_inc_return(&pEndpoint->TxProcessCount) > 1) {
 		/* another thread or task is draining the TX queues on this endpoint
 		 * that thread will reset the tx processing count when the queue is drained */
 		qdf_atomic_dec(&pEndpoint->TxProcessCount);
@@ -1122,10 +1121,11 @@ static HTC_SEND_QUEUE_RESULT htc_try_send(HTC_TARGET *target,
 
 	}
 
-	UNLOCK_HTC_TX(target);
 	/* done with this endpoint, we can clear the count */
 	qdf_atomic_init(&pEndpoint->TxProcessCount);
 
+	UNLOCK_HTC_TX(target);
+
 	AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("-htc_try_send:  \n"));
 
 	return HTC_SEND_QUEUE_OK;