drivers/isdn/mISDN: fix sparse warnings: make symbols static

Fix this sparse warnings:
  drivers/isdn/mISDN/clock.c:44:1: warning: symbol 'iclock_lock' was not declared. Should it be static?
  drivers/isdn/mISDN/clock.c:45:9: warning: symbol 'iclock_count' was not declared. Should it be static?
  drivers/isdn/mISDN/clock.c:46:17: warning: symbol 'iclock_tv' was not declared. Should it be static?
  drivers/isdn/mISDN/clock.c:47:9: warning: symbol 'iclock_tv_valid' was not declared. Should it be static?
  drivers/isdn/mISDN/clock.c:48:20: warning: symbol 'iclock_current' was not declared. Should it be static?

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/mISDN/clock.c

@@ -41,11 +41,11 @@
 
 static u_int *debug;
 static LIST_HEAD(iclock_list);
-DEFINE_RWLOCK(iclock_lock);
-u16	iclock_count;		/* counter of last clock */
-struct	timeval iclock_tv;	/* time stamp of last clock */
-int	iclock_tv_valid;	/* already received one timestamp */
-struct	mISDNclock *iclock_current;
+static DEFINE_RWLOCK(iclock_lock);
+static u16 iclock_count;		/* counter of last clock */
+static struct timeval iclock_tv;	/* time stamp of last clock */
+static int iclock_tv_valid;		/* already received one timestamp */
+static struct mISDNclock *iclock_current;
 
 void
 mISDN_init_clock(u_int *dp)