MFC: r260053
- There's no need to keep track of resource IDs. - Simplify MSI allocation and release. For a single one, we don't need to fiddle with the MSI count and pci_release_msi(9) is smart enough to just do nothing in case of INTx. - Don't allocate MSI as RF_SHAREABLE. - Use DEVMETHOD_END. - Use NULL instead of 0 for pointers.
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