macosx: fix crash when audio effects panel was opened

close #6252
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>
(cherry picked from commit 73741d01)

modules/gui/macosx/AudioEffects.m

@@ -189,10 +189,8 @@ static bool GetEqualizerStatus( intf_thread_t *p_custom_intf,
 {
     vlc_object_t *p_object = VLC_OBJECT(getAout());
     if( p_object == NULL )
-        p_object = VLC_OBJECT(pl_Get( VLCIntf ));
+        p_object = vlc_object_hold(pl_Get( p_intf ));
 
-    if( p_object )
-    {
     char *psz_preset;
 
     var_Create( p_object, "equalizer-preset", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
@@ -233,7 +231,7 @@ static bool GetEqualizerStatus( intf_thread_t *p_custom_intf,
         }
     }
     free( psz_preset );
-    }
+    vlc_object_release( p_object );
 
     [self equalizerUpdated];
 }