Fix segfault in h5dump caused by corrupted btree node level #5002
+25
−10
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Re-do of PR #4862
Added another argument, expected node level, to H5B__iterate_helper to pass down to H5B__cache_deserialize for checking the decoded node level. When this expected level is not known, the new macro H5_UNKNOWN_NODELEVEL (-1) will be used for not checking the level.
Fixes GH-4432