illumos gate

Build errors on SPARC:

    ../../common/nic/topo_nic.c: In function 'nic_create_transceiver':
    ../../common/nic/topo_nic.c:256:13: error: 'port' may be used uninitialized in t
    his function [-Werror=maybe-uninitialized]
      if ((ret = nic_port_datalink_props(mod, port, handle, linkid)) != 0)
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    cc1: all warnings being treated as errors
    Current working directory /code/illumos-gate/usr/src/lib/fm/topo/modules/common/nic

    ../platform-mem/mem_mdesc.c: In function 'find_grp':
    ../platform-mem/mem_mdesc.c:225:7: error: 'err' may be used uninitialized in thi
    s function [-Werror=maybe-uninitialized]
        err++;
        ~~~^~
    cc1: all warnings being treated as errors
    Current working directory /code/illumos-gate/usr/src/lib/fm/topo/modules/sun4v/dimm

    pi_subr.c: In function 'pi_get_chassisid':
    pi_subr.c:382:5: error: 'result' may be used uninitialized in this function [-We
    rror=maybe-uninitialized]
      if (result != 0 || id == NULL || strlen(id) == 0) {
         ^
    cc1: all warnings being treated as errors
    Current working directory /code/illumos-gate/usr/src/lib/fm/topo/modules/sun4v/sun4vpi

Testing done: nightly build.