staging: dgnc: remove some global variables

There were some global variables not being used at all, so just delete
them.

Cc: Lidza Louina <lidza.louina@gmail.com>
Cc: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_driver.c

@@ -22,7 +22,6 @@ MODULE_SUPPORTED_DEVICE("dgnc");
 
 static unsigned int dgnc_num_boards;
 struct dgnc_board		*dgnc_board[MAXBOARDS];
-DEFINE_SPINLOCK(dgnc_global_lock);
 static DEFINE_SPINLOCK(dgnc_poll_lock); /* Poll scheduling lock */
 int			dgnc_poll_tick = 20;	/* Poll interval - 20 ms */
 

drivers/staging/dgnc/dgnc_driver.h

@@ -372,9 +372,7 @@ struct channel_t {
 	ulong		ch_xoff_sends;
 };
 
-extern uint		dgnc_major;		/* Our driver/mgmt major */
 extern int		dgnc_poll_tick;		/* Poll interval - 20 ms */
-extern spinlock_t	dgnc_global_lock;	/* Driver global spinlock */
 extern struct dgnc_board *dgnc_board[MAXBOARDS];/* Array of boards */
 
 #endif	/* _DGNC_DRIVER_H */