nfp: avoid rearming the interrupts when in busy poll

Make use of return code from napi_complete_done() to avoid rearming
interrupts when busy polling is on.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -1705,10 +1705,9 @@ static int nfp_net_poll(struct napi_struct *napi, int budget)
 			nfp_net_xdp_complete(r_vec->xdp_ring);
 	}
 
-	if (pkts_polled < budget) {
-		napi_complete_done(napi, pkts_polled);
+	if (pkts_polled < budget)
+		if (napi_complete_done(napi, pkts_polled))
 			nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
-	}
 
 	return pkts_polled;
 }