fix 'tog tree' usage displayed in error case (patch by naddy@)
diff --git a/tog/tog.c b/tog/tog.c
index 62fbbf3..1532cdc 100644
--- a/tog/tog.c
+++ b/tog/tog.c
@@ -4987,7 +4987,7 @@ cmd_tree(int argc, char *argv[])
if (repo_path == NULL)
return got_error_from_errno2("realpath", argv[0]);
} else
- usage_log();
+ usage_tree();
init_curses();