qcacmn: Flush TxLookupQueue for ENDPOINT_0 during htc_cleanup

When driver unload is triggered, check_for_leaks complains,
saying it finds pending entries in TxLookupQueue of ENDPOINT_0.

Flush pending entries in TxLookupQueue for ENDPOINT_0 during htc_cleanup.

Change-Id: Ica661453d5cef283526cfa1e7267d5349b5e2310
CRs-Fixed: 2249980

htc/htc.c

@@ -187,6 +187,8 @@ static void htc_cleanup(HTC_TARGET *target)
 	}
 #endif
 
+	htc_flush_endpoint_txlookupQ(target, ENDPOINT_0);
+
 	qdf_spinlock_destroy(&target->HTCLock);
 	qdf_spinlock_destroy(&target->HTCRxLock);
 	qdf_spinlock_destroy(&target->HTCTxLock);