drm/managed: Fix off-by-one in warning

I'm thinking this is the warning that fired in the 0day report, but I
can't double-check yet since 0day didn't upload its source tree
anywhere I can check. And all the drivers I can easily test don't use
drm_dev_alloc anymore ...

Also if I'm correct supreme amounts of bad luck because usually kslap
(for bigger structures) gives us something quite a bit bigger than
what we asked for.

[0day uploaded tree, guess is correct]

Reported-by: kernel test robot <[email protected]>
Fixes: c6603c740e0e ("drm: add managed resources tied to drm_device")
Reviewed-by: Sam Ravnborg <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Neil Armstrong <[email protected]
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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