yahoo: Fix reading memory locations past the buffer bounds
* Also improve behavior when parsing malformed P2P packets (it seems like it
might be better to just disconnect when this happens, but I'm not familiar
with why the code as added to try to handle the malformed packets).
* Also, add a comment about the mistaken assumption in p2p packet handling that
reads are being buffered and that partial packets can be subsequently filled
in.
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# Pidgin and Finch: The Pimpin' Penguin IM Clients That're Good for the Soul
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