MFC r283104:   Read GEOM_UNCOMPRESS metadata using several requests that fit into   MAXPHYS. For large compressed images the metadata size can be bigger   than MAXPHYS and this triggers KASSERT in g_read_data().   Also use g_free() to free memory allocated by g_read_data().
MFC r283104:
  Read GEOM_UNCOMPRESS metadata using several requests that fit into
  MAXPHYS. For large compressed images the metadata size can be bigger
  than MAXPHYS and this triggers KASSERT in g_read_data().
  Also use g_free() to free memory allocated by g_read_data().

  PR:		199476

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