Snippets for less 704 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/less/704/2.fc45/data/logs/s390x/build.log.

ch.c:450:33: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  450 |                                 write(logfile, bp->data, bp->datasize);
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ch.c:313:33: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  313 |                                 write(logfile, &bp->data[bp->datasize], (size_t) n);
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

edit.c:631:9: warning: ‘chflags’ may be used uninitialized [-Wmaybe-uninitialized]
  631 |         ch_init(f, chflags, nread);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~

edit.c:681:21: warning: ‘filename’ may be used uninitialized [-Wmaybe-uninitialized]
  681 |                 if (strcmp(filename, FAKE_HELPFILE) && strcmp(filename, FAKE_EMPTYFILE))
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

edit.c:644:21: warning: ‘open_filename’ may be used uninitialized [-Wmaybe-uninitialized]
  644 |                 if (strcmp(open_filename, "-") != 0)
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~

edit.c:627:9: warning: ‘alt_filename’ may be used uninitialized [-Wmaybe-uninitialized]
  627 |         set_altfilename(curr_ifile, alt_filename);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

lsystem.c:119:17: warning: ignoring return value of ‘dup’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  119 |                 dup(inp);
      |                 ^~~~~~~~

lsystem.c:154:9: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  154 |         system(p);
      |         ^~~~~~~~~

lsystem.c:179:9: warning: ignoring return value of ‘dup’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  179 |         dup(inp);
      |         ^~~~~~~~