output_docbook.cpp warnings for comparison of different signedness

[Scott Kostyshak]

I get the following warnings:

/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp: In function ‘void lyx::{anonymous}::makeParagraph(const lyx::Text&, const lyx::Buffer&, lyx::XMLStream&, const lyx::OutputParams&, const const_iterator&)’:
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp:357:26: error: comparison of integer expressions of different signedness: ‘long int’ and ‘long unsigned int’ [-Werror=sign-compare]
  357 |  special_case |= nInsets == parSize && std::all_of(par->insetList().begin(), par->insetList().end(), [](InsetList::Element inset) {
      |                  ~~~~~~~~^~~~~~~~~~
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp:378:26: error: comparison of integer expressions of different signedness: ‘long int’ and ‘long unsigned int’ [-Werror=sign-compare]
  378 |  special_case |= nInsets == parSize && std::all_of(par->insetList().begin(), par->insetList().end(), isLyxCodeSpecialCase);
      |                  ~~~~~~~~^~~~~~~~~~
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp: In lambda function:
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp:401:17: error: comparison of integer expressions of different signedness: ‘long int’ and ‘long unsigned int’ [-Werror=sign-compare]
  401 |     if (nInsets != parSize)
      |         ~~~~~~~~^~~~~~~~~~
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp: In function ‘void lyx::{anonymous}::makeParagraph(const lyx::Text&, const lyx::Buffer&, lyx::XMLStream&, const lyx::OutputParams&, const const_iterator&)’:
/home/scott/lyxbuilds/master/repo/src/output_docbook.cpp:412:26: error: comparison of integer expressions of different signedness: ‘long int’ and ‘long unsigned int’ [-Werror=sign-compare]
  412 |  special_case |= nInsets == parSize && std::all_of(par->insetList().begin(), par->insetList().end(), isFlexSpecialCase);
      |                  ~~~~~~~~^~~~~~~~~~

Scott
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