Staging: comedi: fix NULL initilization issue in pcl818.c

This is a patch to the pcl818.c file that fixes up a NULL initilization
warning found by the checkpatch.pl tool.
Signed-off-by: Ravishankar Karkala Mallikarjunayya <ravishankar.km@greenturtles.in>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/pcl818.c

@@ -252,8 +252,8 @@ static int pcl818_attach(struct comedi_device *dev,
 static int pcl818_detach(struct comedi_device *dev);
 
 #ifdef unused
-static int RTC_lock = 0;	/* RTC lock */
-static int RTC_timer_lock = 0;	/* RTC int lock */
+static int RTC_lock;	/* RTC lock */
+static int RTC_timer_lock;	/* RTC int lock */
 #endif
 
 struct pcl818_board {