gstadaptivedemux: fix memory leak

GstQuery leaks when using invalid url

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5154>

subprojects/gst-plugins-good/ext/adaptivedemux2/gstadaptivedemux.c

@@ -986,6 +986,7 @@ handle_incoming_manifest (GstAdaptiveDemux * demux)
       GST_ELEMENT_ERROR (demux, STREAM, DEMUX,
           (_("Invalid manifest URI")),
           ("Manifest URI needs to use either data:, http:// or https://"));
+      gst_query_unref (query);
       ret = FALSE;
       goto unlock_out;
     }