logind: make VT numbers unsigned

Fix the whole code to use "unsigned int" for vtnr. 0 is an invalid vtnr so
we don't need negative numbers at all.

Note that most code already assumes it's unsigned so in case there's a
negative vtnr, our code may, under special circumstances, silently break.
So this patch makes sure all sources of vtnrs verify the validity. Also
note that the dbus api already uses unsigned ints.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/login/logind.h b/src/login/logind.h
index 814964ff9d..b84137c78b 100644
--- a/src/login/logind.h
+++ b/src/login/logind.h
@@ -137,7 +137,7 @@ int manager_process_button_device(Manager *m, struct udev_device *d);
 
 int manager_startup(Manager *m);
 int manager_run(Manager *m);
-int manager_spawn_autovt(Manager *m, int vtnr);
+int manager_spawn_autovt(Manager *m, unsigned int vtnr);
 
 void manager_gc(Manager *m, bool drop_not_started);