[rhythmbox/wip/hadess/cleanups] metadata: Fix compile-time warning

[Bastien Nocera <hadess src gnome org>]

commit dc8c8eaf629dad93ad2c4da188eae5476b3abde3
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Oct 18 16:32:14 2021 +0200

    metadata: Fix compile-time warning
    
    In file included from /usr/include/glib-2.0/gobject/gbinding.h:29:0,
                     from /usr/include/glib-2.0/glib-object.h:23,
                     from ../../metadata/rb-ext-db.h:31,
                     from ../../metadata/rb-ext-db.c:37:
    ../../metadata/rb-ext-db.c: In function 'impl_constructor':
    /usr/include/glib-2.0/gobject/gobject.h:512:33: error: return from incompatible pointer type 
[-Werror=incompatible-pointer-types]
     #define g_object_ref(Obj)      ((__typeof__(Obj)) (g_object_ref) (Obj))
                                    ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ../../metadata/rb-ext-db.c:349:11: note: in expansion of macro 'g_object_ref'
        return g_object_ref (inst);
               ^~~~~~~~~~~~

 metadata/rb-ext-db.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/metadata/rb-ext-db.c b/metadata/rb-ext-db.c
index 2307bca60..18c2645d0 100644
--- a/metadata/rb-ext-db.c
+++ b/metadata/rb-ext-db.c
@@ -346,7 +346,7 @@ impl_constructor (GType type, guint n_construct_properties, GObjectConstructPara
                RBExtDB *inst = l->data;
                if (g_strcmp0 (name, inst->priv->name) == 0) {
                        rb_debug ("found existing metadata store %s", name);
-                       return g_object_ref (inst);
+                       return g_object_ref (G_OBJECT (inst));
                }
        }