zdb -R has a minor flaw in which it will not always print the full
output of a decompressed block. Oops.
While I was in there, I also reworked the logic so it won't try
ZLE unless everything else fails, which will hopefully avoid the
problem ZDB_NO_ZLE was intended to mitigate of reporting a lot of
false positives of ZLE compressed blocks...
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes#15723
1f5bf96001