Handle block pointers with a corrupt logical size #4080
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Commit 5f6d0b6 was originally added to gracefully handle block
pointers with a damaged logical size. However, it incorrectly
assumed that all passed arc_done_func_t could handle a NULL
arc_buf_t.
Signed-off-by: Brian Behlendorf behlendorf1@llnl.gov
Issue #4069