zvol_os: Fix handling of zvol private data

zvol private data is supposed to be nulled by zvol_clear_private before
zvol_free is called as an indicator that the zvol is going away.

Implement zvol_clear_private for volmode=dev.

Assert that zvol_clear_private has been called before zvol_free.

Check that zvol_clear_private has not been called when updating
volsize.  If it has, fail with ENXIO.

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Matt Macy <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #11117

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