net/mlx4: remove useless assignment

The mlx4_ibv_device_to_pci_addr function defines a variable called ret
inside a loop and uses it.

During the loop, the function assigns a value within the variable and
breaks from the loop, so that this assigning has done nothing and is
actually unnecessary.

Remove the unnecessary assigning.

Signed-off-by: Michael Baum <michaelba@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>

drivers/net/mlx4/mlx4.c

@@ -492,7 +492,6 @@ mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 			   &pci_addr->bus,
 			   &pci_addr->devid,
 			   &pci_addr->function) == 4) {
-			ret = 0;
 			break;
 		}
 	}