[RFT, PATCH] Fix file->offset handling

[Vladimir 'phcoder' Serbinenko]

Hello. As I mentioned in my previous e-mail there seems to be a
problem in how HFS manages file->offset. Similar problems seem to
affect other filesystems as well. The similar check is already done in
kern/file.c I extend it to check for offsets past the file too and
eliminate the check in filesystems. In some cases I keep the check
because same function is used internally in filesystem module too

-- 
Regards
Vladimir 'phcoder' Serbinenko

Personal git repository: http://repo.or.cz/w/grub2/phcoder.git

fsfix.diff
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