staging: dgnc: make dgnc_poll_tick static

No one needs to see this global variable, so make it static.

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

@@ -23,8 +23,8 @@ MODULE_SUPPORTED_DEVICE("dgnc");
 static unsigned int dgnc_num_boards;
 struct dgnc_board		*dgnc_board[MAXBOARDS];
 static DEFINE_SPINLOCK(dgnc_poll_lock); /* Poll scheduling lock */
-int			dgnc_poll_tick = 20;	/* Poll interval - 20 ms */
 
+static int		dgnc_poll_tick = 20;	/* Poll interval - 20 ms */
 static ulong		dgnc_poll_time; /* Time of next poll */
 static uint		dgnc_poll_stop; /* Used to tell poller to stop */
 static struct timer_list dgnc_poll_timer;

drivers/staging/dgnc/dgnc_driver.h

@@ -372,7 +372,6 @@ struct channel_t {
 	ulong		ch_xoff_sends;
 };
 
-extern int		dgnc_poll_tick;		/* Poll interval - 20 ms */
 extern struct dgnc_board *dgnc_board[MAXBOARDS];/* Array of boards */
 
 #endif	/* _DGNC_DRIVER_H */