Ben Gras f53651de01 VM,MFS: better handling of some exceptional cases
Fix for problems reported by Alejandro Hernández:
	. VM unmap: handle case where there is no nextvr

Fixes for problems found by running Melkor ELF fuzzing tool:
	. VM: better handle case where region prealloc fails by
	  freeing memory that was allocated so far
	. MFS fs_readwrite: EOF check should happen for read and
	  peek requests, not just read

This fixes #4.

Change-Id: I2adf4eebdfb4c48a297beff0478eed5c917a53a4
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