tree: initialize the id we use for testing submodule insertions #4553
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Instead of laving it uninitialized and relying on luck for it to be non-zero,
let's give it a dummy hash so we make valgrind happy (in this case the hash
comes from
sha1sum </dev/null
.This is just in the test so it's not that important, but it'd be good to release with a clean valgrind output.
/cc @ethomson @pks-t this should go in before the release