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Revert "Fix unused variable warning in ffs_snapshot.c"

Description

Revert "Fix unused variable warning in ffs_snapshot.c"

This reverts commit 6ef6d3424f158a797d280ebd3103d4d833d41230.

The ffs_snapshot.c code in stable/12 is pretty far behind, and merging
all the additional changesets needed is too much churn.