net: ena: Fix error return code in ena_device_init()

BugLink: http://bugs.launchpad.net/bugs/1664312

Fix to return a negative error code from the invalid dma width
error handling case instead of 0.
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 6e22066f)
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -2329,6 +2329,7 @@ static int ena_device_init(struct ena_com_dev *ena_dev, struct pci_dev *pdev,
 	dma_width = ena_com_get_dma_width(ena_dev);
 	if (dma_width < 0) {
 		dev_err(dev, "Invalid dma width value %d", dma_width);
+		rc = dma_width;
 		goto err_mmio_read_less;
 	}