staging: rtl8712: removed unused variables from struct _adapter

This patch removed following unused member variables from struct _adapter

IsrContent, xmitThread, evtThread, recvThread
Signed-off-by: Deepak Mishra <linux.dkm@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/drv_types.h

@@ -148,13 +148,9 @@ struct _adapter {
 	bool	driver_stopped;
 	bool	surprise_removed;
 	bool	suspended;
-	u32	IsrContent;
 	u8	eeprom_address_size;
 	u8	hw_init_completed;
 	struct task_struct *cmd_thread;
-	pid_t evtThread;
-	struct task_struct *xmitThread;
-	pid_t recvThread;
 	uint (*dvobj_init)(struct _adapter *adapter);
 	void (*dvobj_deinit)(struct _adapter *adapter);
 	struct net_device *pnetdev;