reconnect_one(): use lookup_one_len_unlocked()
... and explain the non-obvious logics in case when lookup yields
a different dentry.
Signed-off-by: 
Al Viro <viro@zeniv.linux.org.uk>
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... and explain the non-obvious logics in case when lookup yields
a different dentry.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>