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LinuxKPI: correct the LINUXKPI_VERSION check for abs_diff()
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Authored by bz on Aug 21 2025, 8:59 AM.
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Details

Summary

The code introduced abs_diff() as migrated from drm to standard
linux headers. The LINUXKPI_VERSION check did not allow this to
be visible by default in-tree. Make sure the v6.6 check is optional.
drm-kmod always defines LINUXKPI_VERSION so this should be fine.

Sponsored by: The FreeBSD Foundation
Fixes: afc450fac9f04
MFC after: 3 days

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rG FreeBSD src repository
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