Clean follow_dotdot() up a bit
No need to open-code follow_up() in it and locking can be lighter.
Signed-off-by: 
Al Viro <viro@zeniv.linux.org.uk>
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No need to open-code follow_up() in it and locking can be lighter.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>