[media] exynos4-is: fimc-lite: Index out of bounds if no pixelcode found

In case no valid pixelcode is found, an i of -1 after the loop is out of
bounds for the array.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/exynos4-is/fimc-lite-reg.c

@@ -133,7 +133,7 @@ void flite_hw_set_source_format(struct fimc_lite *dev, struct flite_frame *f)
 	int i = ARRAY_SIZE(src_pixfmt_map);
 	u32 cfg;
 
-	while (--i >= 0) {
+	while (--i) {
 		if (src_pixfmt_map[i][0] == pixelcode)
 			break;
 	}
@@ -240,7 +240,7 @@ static void flite_hw_set_out_order(struct fimc_lite *dev, struct flite_frame *f)
 	u32 cfg = readl(dev->regs + FLITE_REG_CIODMAFMT);
 	int i = ARRAY_SIZE(pixcode);
 
-	while (--i >= 0)
+	while (--i)
 		if (pixcode[i][0] == f->fmt->mbus_code)
 			break;
 	cfg &= ~FLITE_REG_CIODMAFMT_YCBCR_ORDER_MASK;