bnx2x: Calling pci_set_drvdata earlier

In case of error, bnx2x_init_dev calls pci_set_drvdata(pdev, NULL)

Signed-off-by: Yitchak Gertner <gertner@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>