media: i2c: rdacm21: Fix uninitialized value

Fix the following smatch warning:

drivers/media/i2c/rdacm21.c:373 ov10640_check_id() error: uninitialized
symbol 'val'.

Initialize 'val' to 0 in the ov10640_check_id() function.

Fixes: 2b821698 ("media: i2c: rdacm21: Power up OV10640 before OV490")
Reported-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/i2c/rdacm21.c

@@ -351,7 +351,7 @@ static void ov10640_power_up(struct rdacm21_device *dev)
 static int ov10640_check_id(struct rdacm21_device *dev)
 {
 	unsigned int i;
-	u8 val;
+	u8 val = 0;
 
 	/* Read OV10640 ID to test communications. */
 	for (i = 0; i < OV10640_PID_TIMEOUT; ++i) {