[erlang-patches] Discrepancy in prim_file

[Stavros Aronis]

Details in the commit message:

  git fetch git://github.com/aronisstav/otp.git prim-file-fix

I've tested this patch by running:
- the test suite kernel/prim_file_SUITE
- the experimental version of Dialyzer that discovered the discrepancy
(nearly all of the warnings in
http://dialyzer.softlab.ntua.gr/intersection/disco and all the
warnings in http://dialyzer.softlab.ntua.gr/intersection/otp-erts stem
from this discrepancy. Other applications affected include OTP kernel
and ssl, hibari, scalaris and yaws.)