[PATCH] pasemi_mac: mac_to_intf() error not noticed

[Roel Kluin <roel.kluin@gmail.com>]

mac_to_intf() can return -1 when no device or function was found, but when
mac->dma_if is unsigned. The error wasn't noticed.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 5eeb5a8..1857974 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -1798,12 +1798,13 @@ pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 
-	mac->dma_if = mac_to_intf(mac);
-	if (mac->dma_if < 0) {
+	err = mac_to_intf(mac);
+	if (err < 0) {
 		dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
 		err = -ENODEV;
 		goto out;
 	}
+	mac->dma_if = err;
 
 	switch (pdev->device) {
 	case 0xa005: