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e7d51505c7
If you already have a string (of potentially-binary data) in the form of a ptrlen reference to somewhere else, and you want to keep a copy somewhere, it's useful to copy it into a strbuf. But it takes a couple of lines of faff to do that, and it's nicer to wrap that up into a tiny helper function. This commit adds that helper function strbuf_dup, and its non-movable sibling strbuf_dup_nm for secret data. Also, gone through the existing code and found a bunch of cases where this makes things less verbose.