uml: fix helper_wait calls in watchdog

In commit 1aa351a308d2c3ddb92b6cc45083fc54271d0010 ("uml: tidy helper
code") the arguments of helper_wait() were changed.  The adaptation of
harddog_user.c was forgotten, so this errors occur:

  /arch/um/drivers/harddog_user.c: In function 'start_watchdog':
  /arch/um/drivers/harddog_user.c:82: error: too many arguments to function 'helper_wait'
  /arch/um/drivers/harddog_user.c:89: error: too many arguments to function 'helper_wait'

Signed-off-by: Johann Felix Soden <johfel@users.sourceforge.net>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/drivers/harddog_user.c

@@ -79,14 +79,14 @@ int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
 	n = read(in_fds[0], &c, sizeof(c));
 	if (n == 0) {
 		printk("harddog_open - EOF on watchdog pipe\n");
-		helper_wait(pid, 1, NULL);
+		helper_wait(pid);
 		err = -EIO;
 		goto out_close_out;
 	}
 	else if (n < 0) {
 		printk("harddog_open - read of watchdog pipe failed, "
 		       "err = %d\n", errno);
-		helper_wait(pid, 1, NULL);
+		helper_wait(pid);
 		err = n;
 		goto out_close_out;
 	}