switch flock to fget_light/fput_light

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/locks.c

@@ -1636,12 +1636,13 @@ EXPORT_SYMBOL(flock_lock_file_wait);
 SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
 {
 	struct file *filp;
+	int fput_needed;
 	struct file_lock *lock;
 	int can_sleep, unlock;
 	int error;
 
 	error = -EBADF;
-	filp = fget(fd);
+	filp = fget_light(fd, &fput_needed);
 	if (!filp)
 		goto out;
 
@@ -1674,7 +1675,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
 	locks_free_lock(lock);
 
  out_putf:
-	fput(filp);
+	fput_light(filp, fput_needed);
  out:
 	return error;
 }