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6280 libzfs: unshare_one() could fail with EZFS_SHARENFSFAILED Reviewed by: Toomas Soome <tsoome@me.com> Reviewed by: Dan McDonald <danmcd@omniti.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Gordon Ross <gwr@nexenta.com> References: https://www.illumos.org/issues/6280 https://github.com/illumos/illumos-gate/commit/d1672ef Ported-by: kernelOfTruth kerneloftruth@gmail.com Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>