[erlang-patches] cppcheck(1) inspired changes

[Christian von Roques]

I toyed with cppcheck(1) http://cppcheck.sourceforge.net/
a static analysis tool for C/C++ code.  It warned about several places
in the Erlang sources, but despite its intention to have zero false
positives, not all its findings were caused by real errors in the code.

	git fetch git://github.com/roques/otp.git cppcheck

This branch contains a few changes inspired by cppcheck(1)'s findings,
I don't think any of them are really urgent, but they still are fixes:

 * One potential use of an uninitialized variable when neither ERTS_SMP
   nor ERTS_POLL_ASYNC_INTERRUPT_SUPPORT is defined.

 * Not leaving erl_eterm_state locked when malloc(3) fails in
   erl_eterm_alloc().

 * Two malloc-leaks in error paths of mn_send_write() and ei_reg_restore().

 	Christian.