[hurd,commited] hurd: Fix looking up /dev/tty/ (BZ 34070)

We need to keep the heading / to properly get an ENOTDIR, and set
file_name rather than change the retryname content.

Also, *result is normally used for the startdir.
---
 hurd/lookup-retry.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hurd/lookup-retry.c b/hurd/lookup-retry.c
index 94ff0e3222..2a5ea16cba 100644
--- a/hurd/lookup-retry.c
+++ b/hurd/lookup-retry.c
@@ -323,9 +323,12 @@ __hurd_file_name_lookup_retry (error_t (*use_init_port)
 		    err = opentty (result);
 		    goto out;
 		  case '/':
-		    if (err = opentty (&startdir))
+		    if (*result != MACH_PORT_NULL)
+		      __mach_port_deallocate (__mach_task_self (), *result);
+		    if (err = opentty (result))
 		      goto out;
-		    memmove (retryname, &retryname[4], strlen(retryname + 4) + 1);
+		    startdir = *result;
+		    file_name = &retryname[3];
 		    break;
 		  default:
 		    goto bad_magic;
-- 
2.53.0