file_util: std::move FST entries in ScanDirectoryTree()
Avoids unnecessary copies when building up the FST entries.
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@ -480,7 +480,7 @@ unsigned ScanDirectoryTree(const std::string& directory, FSTEntry& parent_entry,
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(*num_entries_out)++;
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// Push into the tree
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parent_entry.children.push_back(entry);
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parent_entry.children.push_back(std::move(entry));
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return true;
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};
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