ntp: Cleanup xtime references in ntp.c

ntp.c doesn't need to access timekeeping internals directly, so change
xtime references to use the get_seconds() timekeeping interface.
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: richard@rsk.demon.co.uk
LKML-Reference: <1264738844-21935-1-git-send-email-johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/time/ntp.c

@@ -142,11 +142,11 @@ static void ntp_update_offset(long offset)
 	 * Select how the frequency is to be controlled
 	 * and in which mode (PLL or FLL).
 	 */
-	secs = xtime.tv_sec - time_reftime;
+	secs = get_seconds() - time_reftime;
 	if (unlikely(time_status & STA_FREQHOLD))
 		secs = 0;
 
-	time_reftime = xtime.tv_sec;
+	time_reftime = get_seconds();
 
 	offset64    = offset;
 	freq_adj    = (offset64 * secs) <<
@@ -368,7 +368,7 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts)
 	 * reference time to current time.
 	 */
 	if (!(time_status & STA_PLL) && (txc->status & STA_PLL))
-		time_reftime = xtime.tv_sec;
+		time_reftime = get_seconds();
 
 	/* only set allowed bits */
 	time_status &= STA_RONLY;