illumos gate

Build errors from gcc compilers:

    dladm.c: In function 'do_show_bridge':
    dladm.c:8723:8: error: 'field_arr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      oferr = ofmt_open(fields_str, field_arr, ofmtflags, 0, &ofmt);
      ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    dladm.c:8723:8: error: 'all_str' may be used uninitialized in this function [-Werror=maybe-uninitialized]
    dladm.c: In function 'get_secobj_val':
    dladm.c:7169:10: error: 'len' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      return (convert_secobj(buf, len, obj_val, obj_lenp, class));
             ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    dladm.c: In function 'print_link':
    dladm.c:2846:3: error: 'mtu' may be used uninitialized in this function [-Werror=maybe-uninitialized]
       (void) snprintf(lbuf->link_mtu, sizeof (lbuf->link_mtu),
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
           "%u", mtu);
           ~~~~~~~~~~
    cc1: all warnings being treated as errors

    dladm.c: In function 'print_aggr_stats_cb':
    dladm.c:3260:26: error: 'diff_stats' may be used uninitialized in this function [-Werror=maybe-uninitialized]
            (double)diff_stats->opackets/
                    ~~~~~~~~~~^~~~~~~~~~
    dladm.c: In function 'print_xaggr_cb':
    dladm.c:3045:11: error: 'portp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
        (void) dladm_aggr_portstate2str(portp->lp_state,
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            tmpbuf);
            ~~~~~~~
    cc1: all warnings being treated as errors
    *** Error code 1
    dmake: Fatal error: Command failed for target `dladm.o'
    Current working directory /code/illumos-gate/usr/src/cmd/dladm

Testing done: dladm show-link, show-aggr, show-bridge appears to work as expected.