[DE81]uzfs_zvol_worker should not free zio_cmd if zio_cmd is related to rebuild write.

[satbirchhikara]

This fix is avoid double free of zio cmd. This was happening because rebuild was going on volume and meanwhile we have destroyed volume which change state of volume to Offline and freed cmd. Later on same command was freed by rebuild thread. Now fix is to avoid freeing zio cmd in uzfs_zvol_worker if cmd is meant for rebuild write.

[codecov-io]

Codecov Report

Merging #92 into zfs-0.7-release will decrease coverage by 1.17%.
The diff coverage is 33.33%.

@@                 Coverage Diff                 @@
##           zfs-0.7-release      #92      +/-   ##
===================================================
- Coverage            52.05%   50.88%   -1.18%     
===================================================
  Files                  241      241              
  Lines                76806    76808       +2     
===================================================
- Hits                 39985    39080     -905     
- Misses               36821    37728     +907

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