`preconv -h' is aborted by the failed assertion

[Tetsurou Okazaki]

GROFF VERSION:
1.19.3 (CVS HEAD)

MACHINE:
unknown

OS:
FreeBSD 4.10-STABLE

COMPILER:
GCC 2.95.4

INPUT FILES:
none

COMMAND LINE:
preconv -h

DESCRIPTION OF INCORRECT BEHAVIOUR:
`preconv -h' is aborted by the failed assertion as below.
  $ ./src/preproc/preconv/preconv -h
  ./src/preproc/preconv/preconv: Failed assertion at line 1164, file 
`preconv.cpp'.
  Abort trap (core dumped)

SUGGESTED FIX:

Index: src/preproc/preconv/preconv.cpp
===================================================================
RCS file: /cvsroot/groff/groff/src/preproc/preconv/preconv.cpp,v
retrieving revision 1.11
diff -u -c -r1.11 preconv.cpp
*** src/preproc/preconv/preconv.cpp     23 Feb 2006 20:07:25 -0000      1.11
--- src/preproc/preconv/preconv.cpp     23 Apr 2006 22:59:48 -0000
***************
*** 1119,1125 ****
    program_name = argv[0];
    int opt;
    static const struct option long_options[] = {
!     { "help", no_argument, 0, CHAR_MAX + 1 },
      { "version", no_argument, 0, 'v' },
      { NULL, 0, 0, 0 }
    };
--- 1119,1125 ----
    program_name = argv[0];
    int opt;
    static const struct option long_options[] = {
!     { "help", no_argument, 0, 'h' },
      { "version", no_argument, 0, 'v' },
      { NULL, 0, 0, 0 }
    };
***************
*** 1152,1158 ****
      case 'r':
        raw_flag = 1;
        break;
!     case CHAR_MAX + 1:        // --help
        usage(stdout);
        exit(0);
        break;
--- 1152,1158 ----
      case 'r':
        raw_flag = 1;
        break;
!     case 'h': // --help
        usage(stdout);
        exit(0);
        break;