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Fix NULL pointer dereference in dbuf_prefetch_indirect_done()
When ZFS is built with assertions, a prefetch is done on a redacted blkptr and `dpa->dpa_dnode` is NULL, we will have a NULL pointer dereference in `dbuf_prefetch_indirect_done()`. Both Coverity and Clang's Static Analyzer caught this. Reported-by: Coverity (CID 1524671) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes openzfs#14210
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