[vala/0.52] vala: Free empty stack list for code contexts

[Rico Tzschichholz <ricotz src gnome org>]

commit 15648bf2364619d3021feb43ae75998136d3cb10
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Feb 9 17:36:14 2022 +0100

    vala: Free empty stack list for code contexts
    
    While having the stack list created on demand, make sure to destroy it
    when it is not required anymore. Otherwise it will be leaked without an
    option to avoid that to happen.

 vala/valacodecontext.vala | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/vala/valacodecontext.vala b/vala/valacodecontext.vala
index dc1421e6c..f52dd602a 100644
--- a/vala/valacodecontext.vala
+++ b/vala/valacodecontext.vala
@@ -286,6 +286,11 @@ public class Vala.CodeContext {
                }
 
                context_stack->remove_at (context_stack->size - 1);
+
+               if (context_stack->size == 0) {
+                       delete context_stack;
+                       context_stack_key.set (null, null);
+               }
        }
 
        /**