Fix bug that caused a coredump when attempting to enter passive mode when not logged in. Original fix slightly altered by me to return the correct reply code.
Fix bug that caused a coredump when attempting to enter passive mode when
not logged in. Original fix slightly altered by me to return the correct
reply code.

Submitted by:	Vadim Kolontsov <vadim@tversu.ac.ru>

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