Fix ddb(4) "show geom addr" command when INVARIANTS is enabled. Don't assert that the topology lock is held when g_valid_obj() is called from debugger.
Fix ddb(4) "show geom addr" command when INVARIANTS is enabled. Don't
assert that the topology lock is held when g_valid_obj() is called from
debugger.

MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase