Various cleanups: - Don't initialize if_output, ether_ifattach() does this for us. - Use pci_enable_busmaster() instead of using pci_read_config()   and pci_write_config() directly. - Don't try to enable I/O, bus_alloc_resource() does this for us.
Various cleanups:
- Don't initialize if_output, ether_ifattach() does this for us.
- Use pci_enable_busmaster() instead of using pci_read_config()
  and pci_write_config() directly.
- Don't try to enable I/O, bus_alloc_resource() does this for us.

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