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The ranges parent bus address may just be a tag to the entry in the parent

Description

The ranges parent bus address may just be a tag to the entry in the parent
node. Take this in to account by searching until we find the range for the
root node.

Differential Revision: https://reviews.freebsd.org/D1160
Reviewed by: ian
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

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