Comparison is always true due to limited range of data type error in named-journalprint.c on ARM64

stress:authoritative:fedora:33:arm64 job fails to build BIND on ARM64 on add81d64 (!4720 (merged)) with:

named-journalprint.c: In function 'main':
named-journalprint.c:75:57: error: comparison is always true due to limited range of data type [-Werror=type-limits]
   75 |  while ((ch = isc_commandline_parse(argc, argv, "dux")) != -1) {
      |                                                         ^~

The code was added in fb2d0e28.

This blocks stress testing on main and thus the March release.