[gi-docgen/validate-links] gir: Look for callback types

[Emmanuele Bassi <ebassi src gnome org>]

commit 0d0d239bbd044e11fa69ab05abb766145ba3fb58
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue May 25 13:16:36 2021 +0100

    gir: Look for callback types

 gidocgen/gir/ast.py | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gidocgen/gir/ast.py b/gidocgen/gir/ast.py
index 13f321e..e3a86ad 100644
--- a/gidocgen/gir/ast.py
+++ b/gidocgen/gir/ast.py
@@ -879,6 +879,8 @@ class Namespace:
             return self._aliases[name]
         if name in self._bitfields:
             return self._bitfields[name]
+        if name in self._callbacks:
+            return self._callbacks[name]
         if name in self._constants:
             return self._constants[name]
         if name in self._enumerations: