Tweaks to namei.c, need testing

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I am in the process of optimizing some things I've found in elks/fs/minix/namei.c to reduce code size and improve performance. The changes are primarily of the sort where a dereference or a calculation is used multiple times and can be consolidated down to a single operation that is cached instead. I've made other miscellaneous changes that should work fine, but those I am a little more concerned about.

Please feel free to test and make sure everything still works with latest git. I may make more optimization changes like these over the next 24 hours, so git pull before you git commit.

-Jody
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