nfp: flower: add missing clean up call to avoid memory leaks

nfp_flower_metadata_cleanup() is defined but never invoked,
not calling it will cause us to leak mask and statistics
queue memory on the host.

Fixes: 43f84b72c50d ("nfp: add metadata to each flow offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/main.c

@@ -356,6 +356,7 @@ err_free_app_priv:
 
 static void nfp_flower_clean(struct nfp_app *app)
 {
+	nfp_flower_metadata_cleanup(app);
 	vfree(app->priv);
 	app->priv = NULL;
 }