uridecodebin3: free_play_items when READY_TO_PAUSED failed.

We will never go through the PAUSED_TO_READY transition if
that is the case, and thus never free the play items.

gst/playback/gsturidecodebin3.c

@@ -1064,6 +1064,8 @@ gst_uri_decode_bin3_change_state (GstElement * element,
   /* ERRORS */
 failure:
   {
+    if (transition == GST_STATE_CHANGE_READY_TO_PAUSED)
+      free_play_items (uridecodebin);
     return ret;
   }
 }