Robert Edmonds 2c63d76205 protoc-c: Fix -Wsign-compare diagnostics
This commit fixes the following compiler diagnostics:

    ../protoc-c/c_helpers.cc: In function ‘void google::protobuf::compiler::c::PrintComment(google::protobuf::io::Printer*, std::__cxx11::string)’:
    ../protoc-c/c_helpers.cc:221:25: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<std::__cxx11::basic_string<char> >::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
           for (int i = 0; i < comment_lines.size(); i++)
                           ~~^~~~~~~~~~~~~~~~~~~~~~
    ../protoc-c/c_helpers.cc: In function ‘std::set<std::__cxx11::basic_string<char> > google::protobuf::compiler::c::MakeKeywordsMap()’:
    ../protoc-c/c_helpers.cc:273:21: warning: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Wsign-compare]
       for (int i = 0; i < GOOGLE_ARRAYSIZE(kKeywordList); i++) {
                         ^
2023-07-08 20:50:57 -04:00
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