Instead, use fatfs's method for dealing with negative dentries to
preserve case, rather than overwrite dentry name in d_revalidate, which
is a bit ugly and also gets in the way of doing lock-free path walking.
Signed-off-by: NNick Piggin <npiggin@kernel.dk>
Signed-off-by: NSteve French <sfrench@us.ibm.com>