Switch a Component internal variable to "curr_length".
Switch a Component internal variable to "curr_length".

This is to keep it from shadowing the static method by
the same name.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

clalancette/pycdlib,clalancette/pyiso