mfd: max8997: Naturalise cross-architecture discrepancies

If we compile the MAX8997 for a 64bit architecture we receive the following
warnings:

  drivers/mfd/max8997.c: In function ‘max8997_i2c_get_driver_data’:
  drivers/mfd/max8997.c:173:10:
    warning: cast from pointer to integer of different size
     return (int)match->data;
            ^
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/max8997.c

@@ -164,15 +164,15 @@ static struct max8997_platform_data *max8997_i2c_parse_dt_pdata(
 	return pd;
 }
 
-static inline int max8997_i2c_get_driver_data(struct i2c_client *i2c,
+static inline unsigned long max8997_i2c_get_driver_data(struct i2c_client *i2c,
 						const struct i2c_device_id *id)
 {
 	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
-		return (int)match->data;
+		return (unsigned long)match->data;
 	}
-	return (int)id->driver_data;
+	return id->driver_data;
 }
 
 static int max8997_i2c_probe(struct i2c_client *i2c,

include/linux/mfd/max8997-private.h

@@ -387,7 +387,7 @@ struct max8997_dev {
 	struct i2c_client *muic; /* slave addr 0x4a */
 	struct mutex iolock;
 
-	int type;
+	unsigned long type;
 	struct platform_device *battery; /* battery control (not fuel gauge) */
 
 	int irq;