Use task_pid_nr() in ip_vs_sync.c

The sync_master_pid and sync_backup_pid are set in set_sync_pid() and are
used later for set/not-set checks and in printk.  So it is safe to use the
global pid value in this case.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/ipv4/ipvs/ip_vs_sync.c

@@ -794,7 +794,7 @@ static int sync_thread(void *startup)
 
 	add_wait_queue(&sync_wait, &wait);
 
-	set_sync_pid(state, current->pid);
+	set_sync_pid(state, task_pid_nr(current));
 	complete(tinfo->startup);
 
 	/*