xfs: fix leaks and validation errors in logged xattr updates

This short series fixes a couple of places where the deferred xattr
state machine could leak the xfs_da_state structure.  Make log recovery
more robust by checking the op state and attr filter flags of the
recovered log items.

v2: Don't create a new flags namespace for the attr_filter values, since we
    already have one, and add RVB tags.  Fix a crash that Dave found in the
    first patch when node_removename decides to free the da state, but we
    never set the state variable.
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