[media] gspca - cpia1: Fix some warnings

Some variables were set but not used.
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/cpia1.c

@@ -1262,7 +1262,7 @@ static int set_flicker(struct gspca_dev *gspca_dev, int on, int apply)
 static void monitor_exposure(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
-	u8 exp_acc, bcomp, gain, coarseL, cmd[8];
+	u8 exp_acc, bcomp, cmd[8];
 	int ret, light_exp, dark_exp, very_dark_exp;
 	int old_exposure, new_exposure, framerate;
 	int setfps = 0, setexp = 0, setflicker = 0;
@@ -1284,8 +1284,6 @@ static void monitor_exposure(struct gspca_dev *gspca_dev)
 	}
 	exp_acc = gspca_dev->usb_buf[0];
 	bcomp = gspca_dev->usb_buf[1];
-	gain = gspca_dev->usb_buf[2];
-	coarseL = gspca_dev->usb_buf[3];
 
 	light_exp = sd->params.colourParams.brightness +
 		    TC - 50 + EXP_ACC_LIGHT;