V4L/DVB (8870): gspca: Fix dark room problem with sonixb.
When using the sonixb driver in a dark room and given that the autoexposure algorithm starts with a setting most suitable for daylight, the picture produced by the cam may actually be 100% black leading to a avg_lum value of 0, so an avg_lum value of 0 does not always signal an exposure settings change (which it normally does). This patch adds a check for the really black image case and stops dropping all frames as invalid in this case. Signed-off-by: NHans de Goede <j.w.r.degoede@hhs.nl> Signed-off-by: NJean-Francois Moine <moinejf@free.fr> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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