[mutter/wayland] mutter-launch: adapt to systemd API change

[Giovanni Campagna <gcampagna src gnome org>]

commit 2f9c6c4146bc905c82bd4c041999dccdf37413d1
Author: Giovanni Campagna <gcampagn redhat com>
Date:   Wed Sep 11 18:49:47 2013 +0200

    mutter-launch: adapt to systemd API change
    
    The API was changed during the patch review.
    
    (Yes, we were depending on API which was sitting in a patch not
    yet reviewed... you know, vertical integration!)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707929

 src/wayland/weston-launch.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/wayland/weston-launch.c b/src/wayland/weston-launch.c
index 917c429..79068e0 100644
--- a/src/wayland/weston-launch.c
+++ b/src/wayland/weston-launch.c
@@ -571,6 +571,8 @@ setup_tty(struct weston_launch *wl)
                free(tty);
 #ifdef HAVE_SD_SESSION_GET_VT
        } else if (ok == -ENOENT) {
+               unsigned vt;
+
                /* Negative errnos are cool, right?
                   So cool that we can't distinguish "session not found"
                   from "key does not exist in the session file"!
@@ -578,11 +580,11 @@ setup_tty(struct weston_launch *wl)
                   from sd_pid_get_session()...
                */
 
-               ok = sd_session_get_vt(session, &tty);
+               ok = sd_session_get_vt(session, &vt);
                if (ok < 0)
                        error(1, -ok, "could not determine current TTY");
 
-               snprintf(path, PATH_MAX, "/dev/tty%s", tty);
+               snprintf(path, PATH_MAX, "/dev/tty%u", vt);
                wl->tty = open(path, O_RDWR | O_NOCTTY | O_CLOEXEC);
                free(tty);
 #endif