When the server side nfs-over-tls does an upcall to rpc.tlsservd(8)
for the handshake and the rpc.tlsservd "-u" command line option has
been specified, a list of gids may be returned.
The list will be returned in malloc'd memory pointed to by
res.gid.gid_val. To ensure the malloc occurs, res.gid.gid_val must
be NULL before the call. Then, the malloc'd memory needs to be free'd.
mem_free() just calls free(9), so a NULL pointer argument is fine
and a length argument == 0 is ok, since the "len" argument is not used.
This bug would have only affected nfs-over-tls and only when
rpc.tlsservd(8) is running with the "-u" command line option.
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