staging: wilc1000: remove extern declarations of g_linux_wlan

This patch removes extern declaration of g_linux_wlan from the
followings because it is declared as extern in the wilc_wfi_netdevice.h
file.

- linux_mon.c
- linux_wlan_sdio.c
- wilc_wfi_cfgoperations.c
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_mon.c

@@ -24,8 +24,6 @@ struct wilc_wfi_radiotap_cb_hdr {
 	u16 tx_flags;
 } __attribute__((packed));
 
-extern linux_wlan_t *g_linux_wlan;
-
 static struct net_device *wilc_wfi_mon; /* global monitor netdev */
 
 extern int  mac_xmit(struct sk_buff *skb, struct net_device *dev);

drivers/staging/wilc1000/linux_wlan_sdio.c

@@ -23,7 +23,6 @@
 
 
 struct sdio_func *local_sdio_func;
-extern linux_wlan_t *g_linux_wlan;
 extern int wilc_netdev_init(void);
 extern void wilc_handle_isr(void);
 

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -35,7 +35,6 @@ static u8 op_ifcs;
 extern u8 u8ConnectedSSID[6];
 
 u8 g_wilc_initialized = 1;
-extern linux_wlan_t *g_linux_wlan;
 extern bool g_obtainingIP;
 
 #define CHAN2G(_channel, _freq, _flags) {	 \
@@ -2192,7 +2191,6 @@ void WILC_WFI_add_wilcvendorspec(u8 *buff)
  *  @date	01 JUL 2012
  *  @version
  */
-extern linux_wlan_t *g_linux_wlan;
 extern bool bEnablePS;
 static int mgmt_tx(struct wiphy *wiphy,
 		   struct wireless_dev *wdev,