qcacld-3.0: Fix memory leak in wma_utils

Link stats memory is not freed in case of driver
unload happens before more results is received
from firmware.

Fix is to free link stats memory on wma close.

Change-Id: I3c54a0bc4951c70b2ca7116e37e0b62a5c6b7a2f
CRs-Fixed: 2083603
diff --git a/core/wma/src/wma_utils.c b/core/wma/src/wma_utils.c
index 6f6b9cb..7b34f18 100644
--- a/core/wma/src/wma_utils.c
+++ b/core/wma/src/wma_utils.c
@@ -1259,7 +1259,7 @@
  *
  * Return: 0 on success, error number otherwise.
  */
-static int wma_unified_radio_tx_mem_free(void *handle)
+int wma_unified_radio_tx_mem_free(void *handle)
 {
 	tp_wma_handle wma_handle = (tp_wma_handle) handle;
 	tSirWifiRadioStat *rs_results;