Bug in dazukofs_lookup()

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This patch fixes a bug in dazukofs_lookup():

If interpose fails we must not dput() the lower dentry, since at this
time the dentry operations have already been set up. This
includes the d_release() operation which already cares about dput().

This patch also removes some unnecessary lines of code:
- The check for "." and ".." dentries is not needed, since the vfs will 
never pass those
dentries down to our lookup function.
- we never have to unhash() a dentry, since after we hashed a dentry via 
d_add() (in lookup() or
interpose()), there are no errors possible.
- setting up dentry operations in interpose() is redundant (since 
already done in  lookup())

The flag passed to interpose() has been renamed, since it indicates if a 
dentry should be hashed,
not that it already has been hashed.

Please apply this patch after patch 1 that has been posted yesterday.

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