devtool: modify: call shutdown on tinfoil when done
Strictly speaking we ought to explicitly shut down a tinfoil instance
when we're done with it. This doesn't affect modify's operation but is
important if you want to be able to call into modify() from another
plugin (though anyone doing so should be advised that the function is
by no means a stable API and is subject to change in future releases).
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
