[erlang-patches] Some cleanups in kernel files

[Kostis Sagonas]

The code in some kernel modules has been cleaned up so that functions do 
not return terms of wrong type by accident (most notably by having a 
call to !/2 in a return position) and so that language constructs that 
reflect in a more accurate way the program's intention are used.

Please include:

   git fetch git://github.com/kostis/otp.git kernel-cleanup

Kostis