random: align rekey_work's timer

Align rekey_work. Even though it's infrequent, we may as well line it up.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Acked-by: NMatt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/random.c

@@ -1488,7 +1488,8 @@ static void rekey_seq_generator(struct work_struct *work)
 	keyptr->count = (ip_cnt & COUNT_MASK) << HASH_BITS;
 	smp_wmb();
 	ip_cnt++;
-	schedule_delayed_work(&rekey_work, REKEY_INTERVAL);
+	schedule_delayed_work(&rekey_work,
+			      round_jiffies_relative(REKEY_INTERVAL));
 }
 
 static inline struct keydata *get_keyptr(void)