Regression fix: don't modify smack_accesses while applying the rules.

Regression introduced in eaf908fd caused access_type field to be modified,
when smack_accesses_apply() is called with clear set to true.

This patch reverts that, restoring invariant that smack_accessess_apply()
doesn't modify given rule set.
(cherry picked from commit 74f5b5c21a2ed9c0576c3c3ab3802d11d66098a9)