Fix for Issue #48: "You can still receive messages from disconnected users"
Fix for Issue #48: "You can still receive messages from disconnected users"

In the case when a user is disconnected with further messages already pending,
messages can be received from the disconnected user.
This commit will ignore all further data from any user not in ircd.users

Heufneutje/txircd,ElementalAlchemist/txircd