Avoid a double free in devopen by not freeing the device structure in zfs_dev_open.  This stops a panic in the loader when trying to read from a zfs device and no zfs devices exist.
Avoid a double free in devopen by not freeing the device structure
in zfs_dev_open.  This stops a panic in the loader when trying to
read from a zfs device and no zfs devices exist.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase