made a pull request(GSoC)

[Mihir Luthra]

hey everyone,

I was checking porttrace.tcl code.

In the code tracelib is being used both as a command and a variable name.

While loading darwintrace library through DYLD_INSERT_LIBRARIES,
tracelib is used as a variable for storing darwintrace library path.

I renamed that tracelib variable to be darwintracepath.

Mihir
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