Fix leak when breaking out of FilesystemIterator

We need to always destroy current, not just when iter.data is not
set.

Take this opportunity to clean up the iterator destructor

Fix leak when breaking out of FilesystemIterator

We need to always destroy current, not just when iter.data is not
set.

Take this opportunity to clean up the iterator destructor code a
bit, to remove redundant checks and incorrect comments.

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