Crash when passed an unrecognized long option

[ticalc-travis]

I see a crash, both with 0.27.2 and the git version, when passing unrecognized long options, apparently due to the long_options struct in i7z.c not being properly terminated.

$ i7z --version
zsh: segmentation fault (core dumped) i7z --version

Backtrace:
Thread 1 (Thread 0x7ffff7fbf700 (LWP 5425)):
#0 0x00007ffff743110c in __strncmp_sse2 () from /usr/lib/libc.so.6

No symbol table info available.
#1 0x00007ffff747f4b7 in _getopt_internal_r () from /usr/lib/libc.so.6

No symbol table info available.
#2 0x00007ffff7480201 in _getopt_internal () from /usr/lib/libc.so.6

No symbol table info available.
#3 0x00007ffff748027e in getopt_long () from /usr/lib/libc.so.6

No symbol table info available.
#4 0x0000000000401629 in main (argc=2, argv=0x7fffffffe638) at i7z.c:441

    option_index = 0
    log_file_name = "\000\000\000\000\000\000\000\000\257\067\336\367\377\177\000\000\000\000\000\000\000\000\000\000,6\336\367\000\000\000\000\001\000\000\000\000\000\000\000\001\335\377\377\377\17
    log_file_name2 = "\264\341\377\377\377\177\000\000\200B\336\367\377\177\000\000\000\000\000\000\000\000\000\000\\\270\335\367\377\177\000\000H\265\335\367\377\177\000\000\270\341\377\377\377\177
    chi = {max_online_cpu = 0, num_sockets = 0, sibling_num = {0 <repeats 128 times>},
      processor_num = {0 <repeats 128 times>}, package_num = {0 <repeats 128 times>},
      coreid_num = {0 <repeats 48 times>, -136439751, 32767, 0, 0, 1675264, 0, 1675216, 0,
        1675216, 0, 0, 0, 5, 0, 3772416, 0, 3796992, 0, 3795200, 0, 3813200, 0, 1675264, 0, 3,
        32767, 0, 0, 28672, 0, 26668, 0, 26668, 0, 0, 0, 5, 32767, 2121728, 0, -136400236,
        32767, 2126444, 0, -147040927, 32767, 0, 0, -136432483, 32767, 2187264, 0, -136400236,
        0, 1, 0, -141172204, 32767, 0, 0, -136432483, 32767, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
        -136439830, 32767, 0, 0, -136444392, 32767, 390676, 0}, display_cores = {390676, 0,
        -9312, 32767, 0, 0, 2486272, 0, -136373794, 32767, 4, 0, 47, 0, 0, 0, -136420871,
        32767, -8928, 32767, -134467976, 32767, 19, 0, 4196875, 0, 1836017711, 1, 10, 0,
        1768697698, 1932419938, 1, 0, -8928, 32767, -136421849, 32767, 2147479968, 3, -8928,
        32767, -134475776, 32767, -136438680, 32767, -8880, 32767, -136400236, 32767, 0, 3,
        -138952089, 32767, 0, 0, -136432483, 32767, -1279, 4095, -9232, 0, 1, 0, -134467976,
        32767, 4196875, 0, -134225664, 32767, 6, 0, -143335424, 32767, 65037, 0, 529053, 0, 1,
        0, 33261, 0, 0, 0, 0, 0, 1984416, 0, 4096, 0, 3880, 0, 1429418557, 0, 597366993, 0,
        1410679597, 0, 0, 0, 1412366343, 0, 928956310, 0, 0, 0, 0, 0, 0, 0, -134271763, 32767,
        4196875, 0, -134225616, 32767, 0, 0, -134230016, 32767, -134271763, 32767, 0, 0,
        -136432084, 32767, 0, 0}, HT = 176}
    socket_0 = {max_cpu = 0, socket_num = 0, processor_num = {-1, -1, -1, -1, -1, -1, -1, -1,
        0 <repeats 24 times>}, num_physical_cores = 0, num_logical_cores = 0}
    socket_1 = {max_cpu = 0, socket_num = 1, processor_num = {-1, -1, -1, -1, -1, -1, -1, -1,
        0 <repeats 24 times>}, num_physical_cores = 0, num_logical_cores = 0}
    c = <optimized out>
    presupplied_socket_info = false
    long_options = {{name = 0x4096dc "write", has_arg = 1, flag = 0x0, val = 119}, {
        name = 0x40916c "socket0", has_arg = 1, flag = 0x0, val = 122}, {
        name = 0x409174 "socket1", has_arg = 1, flag = 0x0, val = 121}, {
        name = 0x40917c "logfile", has_arg = 1, flag = 0x0, val = 108}, {
        name = 0x409184 "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x409189 "nogui",
        has_arg = 0, flag = 0x0, val = 110}}