[rhythmbox/wip/hadess/cleanups: 29/49] rhythmdb: Fix compile-time warning

[Bastien Nocera <hadess src gnome org>]

commit c0aa87981589c0c1df2ae7c560106a02e2c30326
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Nov 3 11:35:15 2021 +0100

    rhythmdb: Fix compile-time warning
    
    rhythmbox/rhythmdb/rhythmdb-metadata-cache.c: In function ‘rhythmdb_metadata_cache_get’:
    /usr/include/glib-2.0/gobject/gobject.h:528:28: warning: returning ‘GObject *’ {aka ‘struct _GObject *’} 
from a function with incompatible return type ‘RhythmDBMetadataCache *’ {aka ‘struct _RhythmDBMetadataCache 
*’} [-Wincompatible-pointer-types]
      528 | #define g_object_ref(Obj) ((glib_typeof (Obj)) (g_object_ref) (Obj))
          |                           ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    rhythmbox/rhythmdb/rhythmdb-metadata-cache.c:133:24: note: in expansion of macro ‘g_object_ref’
      133 |                 return g_object_ref (obj);
          |                        ^~~~~~~~~~~~

 rhythmdb/rhythmdb-metadata-cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/rhythmdb/rhythmdb-metadata-cache.c b/rhythmdb/rhythmdb-metadata-cache.c
index bc382e33f..e41226770 100644
--- a/rhythmdb/rhythmdb-metadata-cache.c
+++ b/rhythmdb/rhythmdb-metadata-cache.c
@@ -130,7 +130,7 @@ rhythmdb_metadata_cache_get (RhythmDB *db, const char *name)
 
        obj = g_hash_table_lookup (instances, name);
        if (obj)
-               return g_object_ref (obj);
+               return RHYTHMDB_METADATA_CACHE (g_object_ref (obj));
 
        obj = g_object_new (RHYTHMDB_TYPE_METADATA_CACHE,
                            "db", db,