[gtk/alatiera/gdk_create_context_nullable] gdkdisplay: Remove (nullable)

[Jordan Petridis <jpetridis src gnome org>]

commit 4cda2aec57910afff7ffab7be09d8dc0770206d5
Author: Jordan Petridis <jordan centricular com>
Date:   Mon Oct 25 18:40:40 2021 +0300

    gdkdisplay: Remove (nullable)
    
    gdk_display_create_gl_context only returns NULL when there is
    an error set or asserts/aborts. So nullalbe annotation isn't needed.
    
    Similar to 53312cf696516cdeb1c284008992022a210bb233

 gdk/gdkdisplay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index d5defbeb82..c7993d436a 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -1340,7 +1340,7 @@ gdk_display_prepare_gl (GdkDisplay  *self,
  * Before using the returned `GdkGLContext`, you will need to
  * call [method@Gdk.GLContext.make_current] or [method@Gdk.GLContext.realize].
  *
- * Returns: (transfer full) (nullable): the newly created `GdkGLContext`
+ * Returns: (transfer full): the newly created `GdkGLContext`
  *
  * Since: 4.6
  */