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Nothing the user (nor we) really can do about this, but upsets a nice
quiet boot.

Note that this happens mostly on SDVs where OEMs obviously haven't had
a chance yet to appropriately trim the output list.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65988

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: Amend commit message a bit to clarify a question from Paulo.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>