e1000: fix return value not set on error

Dean noticed that 'err' wasn't being set when the "goto err_dma"
statement is executed in the following hunk from the commit. It's value
will be zero as a result of a successful call to e1000_init_hw_struct().

This patch changes the error condition to be correctly propagated.

CC: stable@kernel.org
Signed-off-by: Dean Nelson <dnelson@redhat.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/e1000/e1000_main.c

@@ -971,11 +971,13 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 		 */
 		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 		pci_using_dac = 1;
-	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
-		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 	} else {
-		pr_err("No usable DMA config, aborting\n");
-		goto err_dma;
+		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+		if (err) {
+			pr_err("No usable DMA config, aborting\n");
+			goto err_dma;
+		}
+		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 	}
 
 	netdev->netdev_ops = &e1000_netdev_ops;