[GRASS-git] [OSGeo/grass] d22ee4: iostream: fix -Werror=type-limits warnings (#2799)

[Nicklas Larsson]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: d22ee4748e5b5ffff3a7a666807e680d069d37bd
      https://github.com/OSGeo/grass/commit/d22ee4748e5b5ffff3a7a666807e680d069d37bd
  Author: Nicklas Larsson <n_larsson at yahoo.com>
  Date:   2023-02-02 (Thu, 02 Feb 2023)

  Changed paths:
    M include/grass/iostream/embuffer.h
    M include/grass/iostream/imbuffer.h
    M include/grass/iostream/replacementHeap.h
    M include/grass/iostream/replacementHeapBlock.h

  Log Message:
  -----------
  iostream: fix -Werror=type-limits warnings (#2799)

unsigned int is always >= 0