Nam Cao [off-list ref] writes:

The only user of msi_post_free() - powerpc/pseries - has been changed to
use msi_teardown().

Remove this unused callback.

Signed-off-by: Nam Cao <redacted>
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This patch depends on the powerpc/series conversion patch, which is
currently in powerpc tree:
https://lore.kernel.org/lkml/c7a6d8f27fd217021dea4daad777e81a525ae460.1754903590.git.namcao@linutronix.de/ (local)

I think it is most convenient to apply this patch to powerpc tree, if
everyone is okay with that?

Maddy, do you mind picking this up?

Nam