ceph: get rid of passing callbacks in __dentry_leases_walk()

__dentry_leases_walk() gets a callback and calls it for
a bunch of denties; there are exactly two callers and
we already have a flag telling them apart - lwc->dir_lease.

Seeing that indirect calls are costly these days, let's
get rid of the callback and just call the right function
directly.  Has a side benefit of saner signatures...

[ xiubli: a minor fix in the commit title ]

Signed-off-by: Al Viro <[email protected]>
Reviewed-by: Xiubo Li <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>

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