[media] mt9v032: fix uninitialized variable warning

drivers/media/i2c/mt9v032.c: In function ‘mt9v032_probe’:
  CC [M]  drivers/media/i2c/s5k4ecgx.o
drivers/media/i2c/mt9v032.c:996:20: warning: ‘pdata’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (pdata && pdata->link_freqs) {
                    ^

It can indeed be uninitialized in one corner case. Initialize to NULL.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/mt9v032.c

@@ -882,7 +882,7 @@ static const struct regmap_config mt9v032_regmap_config = {
 static struct mt9v032_platform_data *
 mt9v032_get_pdata(struct i2c_client *client)
 {
-	struct mt9v032_platform_data *pdata;
+	struct mt9v032_platform_data *pdata = NULL;
 	struct v4l2_of_endpoint endpoint;
 	struct device_node *np;
 	struct property *prop;