Fix memory leaks revealed by GC segments
diff --git a/src/lisp/main.c b/src/lisp/main.c
index 2a37b4c..96a2f8e 100644
--- a/src/lisp/main.c
+++ b/src/lisp/main.c
@@ -39,4 +39,5 @@
 	free_all();
 	if (env)
 		del_env(env);
+	gc_pop_segment();
 }