drivers/rtc/rtc-nuc900.c: use NULL instead of 0

check_rtc_access_enable() returns pointer, thus NULL should be used
instead of 0 in order to fix the following sparse warning:

  drivers/rtc/rtc-nuc900.c:102:16: warning: Using plain integer as NULL pointer

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
index 22861c5..248653c 100644
--- a/drivers/rtc/rtc-nuc900.c
+++ b/drivers/rtc/rtc-nuc900.c
@@ -99,7 +99,7 @@
 	if (!timeout)
 		return ERR_PTR(-EPERM);
 
-	return 0;
+	return NULL;
 }
 
 static int nuc900_rtc_bcd2bin(unsigned int timereg,