V4L/DVB (10127): stv06xx: Avoid having y unitialized

As pointed by gcc:

drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c: In function ‘hdcs_set_size’:
drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c:301: warning: ‘y’ may be used uninitialized in this function
Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c

@@ -317,8 +317,10 @@ static int hdcs_set_size(struct sd *sd,
 
 		y = (hdcs->array.height - HDCS_1020_BOTTOM_Y_SKIP - height) / 2
 				+ hdcs->array.top;
-	} else if (height > hdcs->array.height) {
+	} else {
+		if (height > hdcs->array.height)
 			height = hdcs->array.height;
+
 		y = hdcs->array.top + (hdcs->array.height - height) / 2;
 	}