fix resource double deallocation

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Summary

Since rman freed the resource, it is no longer available so don't call to bus_generic_release_resource()

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context added

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deactivate resource

[jrtc27]

sys/dev/pci/pci_host_generic.c

321

The alloc_resource path instead does:

	if (rm == NULL)
		return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child,
		    type, rid, start, end, count, flags));

perhaps the same should be done here, i.e. inverting the condition?

The current code is also a bit inconsistent between using BUS_FOO and bus_generic_foo, though they're equivalent (unless there is no parent, in which case bus_generic_foo will gracefully return EINVAL rather than faulting on a NULL dereference).

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Invert condition

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I like previous version, because it is easier to read the diff