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when enabling, and `desktop-auto-save-cancel-timer' when disabling.
(desktop-auto-save-cancel-timer): New function with some code from
`desktop-auto-save-set-timer'.
(after-init-hook): Don't call `desktop-auto-save-set-timer'.
Instead of setting `desktop-save-mode' to nil, call
`desktop-save-mode' with arg 0.

Fixes: debbugs:16630