Starting ndb_mgmd on a host which isn't in the configuration file as the ndb_mgmd 
(e.g. the ip address is different) would have ndb_mgmd segfault.

There was a check in the code, but it was (potentially) trying to dereference null


ndb/src/mgmsrv/MgmtSrvr.cpp:
  Don't try and print client_addr->sin_addr if client_addr is null