Fix udf_read(). Honor the uio_resid when determining the size of

the block to read and copy out.  This removes the hack in
udf_readatoffset() for only reading one block at a time.  WooHoo!
Remove a redundant test for fragmented fids in both udf_readdir()
and udf_lookup().  Add comment to both as to why the test is
written the way it is.  Add a few more safety checks for brelse().

Thanks to Timothy Shimmin <tes@boing.melbourne.sgi.com> for pointing
out these problems.

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