pstore/ram: Set freed addresses to NULL

For good measure, set all the freed addresses to NULL when managing
przs.

Cc: Anton Vorontsov <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Reviewed-and-tested-by: Guilherme G. Piccoli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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