Port driver memory free

[Vance Shipley]

Eranga,

Your problem is that you have copied my (copyrighted) code written
for use with erlang:port_call/3 and reused it with erlang:port_control/3.
The difference between the two is that port_call/3 uses the external 
term format as encoded by the ei library while port_control/3 uses the
driver binary format.

	-Vance


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