namei: fold should_follow_link() with the step into not-followed link
All callers are followed by the same boilerplate - "if it has returned
0, update nd->path/inode/seq - we are not following a symlink here".
Pull it into the function itself, renaming it into step_into().
Rename WALK_GET to WALK_FOLLOW, while we are at it - more descriptive
name.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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