nouveau: Fix build.

Fixes nouveau build failure introduced at
c73245882c7ff1277b190b97f093f7b423a22f10.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57746
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
(cherry picked from commit a17750b6884939a36947c76a30d3077f1488f943)
1 file changed