Small list fix

[Chris Jefferson]

Sorry if I misunderstood, but in a previous submission I was told not to 
write "--end()". However I wondered across a couple of occurances of 
this very thing in stl_list.h!

A very simple patch, bootstrapped and tests, and produces identical 
output on -O2 to the old version.

Sorry if I misunderstood the exact cases in which doing --end() is and 
is not allowed...

Chris
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