media: mt9v032: fix hblank calculation

commit f17bc3f4 upstream.

Since (min_row_time - crop->width) can be negative, we have to do a signed
comparison here. Otherwise max_t casts the negative value to unsigned int
and sets min_hblank to that invalid value.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/media/i2c/mt9v032.c

@@ -305,8 +305,8 @@ mt9v032_update_hblank(struct mt9v032 *mt9v032)
 
 	if (mt9v032->version->version == MT9V034_CHIP_ID_REV1)
 		min_hblank += (mt9v032->hratio - 1) * 10;
-	min_hblank = max_t(unsigned int, (int)mt9v032->model->data->min_row_time - crop->width,
-			   (int)min_hblank);
+	min_hblank = max_t(int, mt9v032->model->data->min_row_time - crop->width,
+			   min_hblank);
 	hblank = max_t(unsigned int, mt9v032->hblank, min_hblank);
 
 	return mt9v032_write(client, MT9V032_HORIZONTAL_BLANKING, hblank);