(main): create place-holder ticket file with open(O_EXCL | O_CREAT)

instead of creat


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@5065 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/xnlock/xnlock.c

@@ -975,8 +975,13 @@ main (int argc, char **argv)
 
     if (appres.destroytickets) {
 #ifdef KRB4
+	int fd;
+
         dest_tkt();		/* Nuke old ticket file */
-	creat(TKT_FILE, 0600);	/* but keep a place holder */
+				/* but keep a place holder */
+	fd = open (TKT_FILE, O_WRONLY | O_CREAT | O_EXCL, 0600);
+	if (fd >= 0)
+	    close (fd);
 #endif
     }