[XFS] Fix oops in xfs_file_readdir()
When xfs_file_readdir() exactly fills a buffer, it can move it's index past the end of the buffer and dereference it even though the result of the dereference is never used. On some platforms this causes an oops. SGI-PV: 976923 SGI-Modid: xfs-linux-melb:xfs-kern:30458a Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
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