[Bug 206762] -Wtautilogical-pointer-compare issues with drm(4) code

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206762

--- Comment #5 from Dimitry Andric <dim at FreeBSD.org> ---
Some people add this type of null check as a sort of "defensive programming"
practice. For example, if the obj->base member was a pointer instead of an
array, you would definitely need such a null check.  So maybe the rationale is
'better safe than sorry'...

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