qcacld-3.0: Fix -Wmissing-prototypes in lim_process_message_queue

We want to enable the compiler's -Wmissing-prototypes switch, but
there is existing code that is generating warnings. Fix all warnings
in lim_process_message_queue.

Change-Id: Ic95960eef7086a780d46291f7dd49313a144084c
CRs-Fixed: 1095421

core/mac/src/pe/lim/lim_process_message_queue.c

@@ -1138,7 +1138,7 @@ end:
  * @param  pMac      Pointer to Global MAC structure
  * @return QDF_STATUS_SUCCESS or QDF_STATUS_E_FAILURE
  */
-QDF_STATUS lim_send_stop_scan_offload_req(tpAniSirGlobal pMac,
+static QDF_STATUS lim_send_stop_scan_offload_req(tpAniSirGlobal pMac,
 	uint8_t SessionId, uint32_t scan_id, uint32_t scan_requestor_id)
 {
 	tSirMsgQ msg;