Eliminate unused variable warning in error.c, with kMessageBufferSize.
Eliminate unused variable warning in error.c, with kMessageBufferSize.

lvchao0428/gumbo-parser,google/gumbo-parser,abc00/gumbo-parser,kevinhendricks/gumbo-parser,kevinhendricks/gumbo-parser,aleksandaratanasov/gumbo-parser,lvchao0428/gumbo-parser,aleksandaratanasov/gumbo-parser,abc00/gumbo-parser,kevinhendricks/gumbo-parser,luoxn28/gumbo-parser,f123h456/gumbo-parser,aleksandaratanasov/gumbo-parser,f123h456/gumbo-parser,luoxn28/gumbo-parser,abc00/gumbo-parser,mcanthony/gumbo-parser,lvchao0428/gumbo-parser,google/gumbo-parser,mcanthony/gumbo-parser,aleksandaratanasov/gumbo-parser,f123h456/gumbo-parser,luoxn28/gumbo-parser,lvchao0428/gumbo-parser,kevinhendricks/gumbo-parser,abc00/gumbo-parser,mcanthony/gumbo-parser,google/gumbo-parser,f123h456/gumbo-parser,google/gumbo-parser,abc00/gumbo-parser,aleksandaratanasov/gumbo-parser,lvchao0428/gumbo-parser,mcanthony/gumbo-parser,kevinhendricks/gumbo-parser,f123h456/gumbo-parser,luoxn28/gumbo-parser,mcanthony/gumbo-parser,google/gumbo-parser,luoxn28/gumbo-parser