kern/142924: Small cleanup for the inode struct in ext2fs (based on UFS)

[Pedro F. Giffuni]

I added the equivalent to ufs_lookup.c 1.34:
Bug fixes for currently harmless bugs that could rise to bite
the unwary if the code were called in slightly different ways.

- In ufs_lookup() there is an off-by-one error in the test that checks
if dp->i_diroff is outside the range of the the current directory size.
This is completely harmless, since the following while-loop condition
'dp->i_offset < endsearch' is never met, so the code immediately
does a second pass starting at dp->i_offset = 0.

- Again in ufs_lookup(), the condition in a sanity check is wrong
for directories that are longer than one block. This bug means that



      
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