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Fix a module Makefile error on amd64 so the IPMI HW interfaces are built.

Description

Fix a module Makefile error on amd64 so the IPMI HW interfaces are built.
When the module is being unloaded and no HW interfaces were created don't
clean up. This was exposed by the amd64 module build issue.

Details

Provenance
ambriskoAuthored on
Parents
rS337912: MFC r337727 (rewritten due to unmerged API change in 11+):
Branches
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