[media] gspca - main: Take numerator into account in fps calculations

In case we ever get sub drivers which do 7.5 fps and express this as
15 / 2 fps.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NJean-François Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/gspca.c

@@ -646,9 +646,9 @@ static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 	if (gspca_dev->sd_desc->get_streamparm) {
 		struct v4l2_streamparm parm;
 
-		parm.parm.capture.timeperframe.denominator = 15;
 		gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 		bandwidth *= parm.parm.capture.timeperframe.denominator;
+		bandwidth /= parm.parm.capture.timeperframe.numerator;
 	} else {
 
 		/* don't hope more than 15 fps with USB 1.1 and