nfp: fix error return code in nfp_pci_probe()

Fix to return error code -EINVAL instead of 0 when num_vfs above
limit_vfs, as done elsewhere in this function.

Fixes: 0dc78621 ("nfp: handle SR-IOV already enabled when driver is probing")
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -518,6 +518,7 @@ static int nfp_pci_probe(struct pci_dev *pdev,
 		dev_err(&pdev->dev,
 			"Error: %d VFs already enabled, but loaded FW can only support %d\n",
 			pf->num_vfs, pf->limit_vfs);
+		err = -EINVAL;
 		goto err_fw_unload;
 	}