extcon: adc-jack: Remove the unneeded num_cables field

This patch removes the 'num_cables' filed from 'struct adc_jack_pdata'
because 'struct extcon_dev' contains the 'max_supported' field which
means the number of supported cable of extcon device.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-adc-jack.c

@@ -29,7 +29,6 @@
  * struct adc_jack_data - internal data for adc_jack device driver
  * @edev:		extcon device.
  * @cable_names:	list of supported cables.
- * @num_cables:		size of cable_names.
  * @adc_conditions:	list of adc value conditions.
  * @num_conditions:	size of adc_conditions.
  * @irq:		irq number of attach/detach event (0 if not exist).
@@ -42,7 +41,6 @@ struct adc_jack_data {
 	struct extcon_dev *edev;
 
 	const char **cable_names;
-	int num_cables;
 	struct adc_jack_cond *adc_conditions;
 	int num_conditions;
 
@@ -114,16 +112,6 @@ static int adc_jack_probe(struct platform_device *pdev)
 	}
 	data->edev->name = pdata->name;
 
-	/* Check the length of array and set num_cables */
-	for (i = 0; data->edev->supported_cable[i]; i++)
-		;
-	if (i == 0 || i > SUPPORTED_CABLE_MAX) {
-		dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n",
-				i - 1);
-		return -EINVAL;
-	}
-	data->num_cables = i;
-
 	if (!pdata->adc_conditions ||
 			!pdata->adc_conditions[0].state) {
 		dev_err(&pdev->dev, "error: adc_conditions not defined.\n");