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-session.h b/src/login/logind-session.h
index aab39b72e..939476af5 100644
--- a/src/login/logind-session.h
+++ b/src/login/logind-session.h
@@ -90,7 +90,7 @@ struct Session {
         char *scope_job;
 
         Seat *seat;
-        int vtnr;
+        unsigned int vtnr;
         int vtfd;
         sd_event_source *vt_source;