randconfig build error with next-20131115, in drivers/gpu/drm/nouveau

Building with the attached random configuration file,

drivers/gpu/drm/nouveau/nouveau_hwmon.c: In function ‘nouveau_hwmon_init’: drivers/gpu/drm/nouveau/nouveau_hwmon.c:633:2: error: ‘hwmon’ undeclared (first use in this function) hwmon->hwmon = NULL; ^ drivers/gpu/drm/nouveau/nouveau_hwmon.c:633:2: note: each undeclared identifier is reported only once for each function it appears in make[4]: *** [drivers/gpu/drm/nouveau/nouveau_hwmon.o] Error 1