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string_decoder: fix bad utf8 character handling

Rodrigo Muino Tomonari requested to merge github/fork/mscdex/string-decoder-fix-regression into master
Checklist
  • make -j4 test (UNIX) or vcbuild test nosign (Windows) passes
  • a test and/or benchmark is included
  • the commit message follows commit guidelines
Affected core subsystem(s)
  • string_decoder
Description of change

This commit fixes an issue when extra utf8 continuation bytes appear at the end of a chunk of data, causing miscalculations to be made when checking how many bytes are needed to decode a complete character.

Fixes: https://github.com/nodejs/node/issues/7308

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