[gnome-online-accounts/gnome-3-38] client: Annotate goa_client_get_manager as returning NULL

[Debarshi Ray <debarshir src gnome org>]

commit 801cec0c2622e0938b608b5c00f0b2fc585402d9
Author: Marinus Schraal <mschraal gnome org>
Date:   Tue Sep 1 10:20:14 2020 +0200

    client: Annotate goa_client_get_manager as returning NULL
    
    NULL is a valid return value for goa_client_get_manager and isn't
    accompanied by the throwing of an error. This is why it needs to be
    annotated [1].
    
    This should have been included in commit 728d2bf1ec201977, which
    updated the rest of the goa_client_get_manager documentation to mention
    that it can return NULL.
    
    [1] https://wiki.gnome.org/Projects/GObjectIntrospection/Annotations
    
    https://gitlab.gnome.org/GNOME/gnome-online-accounts/-/issues/139

 src/goa/goaclient.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/goa/goaclient.c b/src/goa/goaclient.c
index 19f2bd66..c3b8c8bf 100644
--- a/src/goa/goaclient.c
+++ b/src/goa/goaclient.c
@@ -405,8 +405,8 @@ goa_client_get_object_manager (GoaClient        *self)
  *
  * Gets the #GoaManager for @self, if any.
  *
- * Returns: (transfer none): A #GoaManager or %NULL. Do not free, the returned
- * object belongs to @self.
+ * Returns: (nullable) (transfer none): A #GoaManager or %NULL. Do not
+ * free, the returned object belongs to @self.
  */
 GoaManager *
 goa_client_get_manager (GoaClient *self)