antirollback: add missing newline and change E2BIG->EPERM.

E2BIG is defined as "Argument list too long" which isn't really accurate.
EPERM is "operation not permitted" which is somewhat more accurate for a
security-related rejection.  EINVAL would also probably be a reasonable
option (and is used for some other reasons the setting might be rejected).

Change-Id: I93f35378e7020baf1f98dff72dcac69658c0d89c
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 32d95c24..2f8ea3e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -376,9 +376,10 @@
 	#define MAX_DELTA       (30*60)
 	long ar_clock = get_antirollback_clock();
 	if (ar_clock != 0 && tv->tv_sec < (ar_clock - MAX_DELTA)) {
-		printk(KERN_ERR "rejecting settimeofday %lu < antirollback %lu",
+		printk(KERN_ERR "rejecting settimeofday %lu < "
+			"antirollback %lu\n",
 			tv->tv_sec, ar_clock);
-		return -E2BIG;
+		return -EPERM;
 	}
 #endif