Purge the incoming data buffer on each new packet, since there's no protocol level fragmentation.
Purge the incoming data buffer on each new packet, since there's no protocol level fragmentation.

svn path=/branches/groupwise_in_anger/kdenetwork/kopete/; revision=338803

Jtalk/kopete-fork-xep0136,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,josh-wambua/kopete,josh-wambua/kopete,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,Jtalk/kopete-fork-xep0136