Merge branch 'master' of https://github.com/bvanassche/fio

* 'master' of https://github.com/bvanassche/fio:
  Ensure that .minfp and .maxfp are respected for FIO_OPT_FLOAT_LIST
  option parsing: Mark arguments that are not modified as 'const'
  parse.h: Remove a superfluous cast
  Only populate the write buffer if necessary
  Rename TD_F_VER_NONE into TD_F_DO_VERIFY
  engines/sg: Make I/O error messages more informative