staging: wilc1000: periodic_rssi can be static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -239,7 +239,7 @@ static struct semaphore hif_sema_thread;
 static struct semaphore hif_sema_driver;
 static struct semaphore hif_sema_wait_response;
 static struct semaphore hif_sema_deinit;
-struct timer_list periodic_rssi;
+static struct timer_list periodic_rssi;
 
 u8 gau8MulticastMacAddrList[WILC_MULTICAST_TABLE_SIZE][ETH_ALEN];