staging: wilc1000: remove unneeded extern variable

This patch removes unnedded extern variable WILC_WFI_devs[] which is not used.
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_netdevice.h

@@ -227,7 +227,6 @@ struct WILC_WFI_mon_priv {
 
 int wilc1000_wlan_init(struct net_device *dev, perInterface_wlan_t *p_nic);
 
-extern struct net_device *WILC_WFI_devs[];
 void wilc_frmw_to_linux(struct wilc *wilc, u8 *buff, u32 size, u32 pkt_offset);
 void wilc_mac_indicate(struct wilc *wilc, int flag);
 void wilc_rx_complete(struct wilc *wilc);