mfd: max8998: Naturalise cross-architecture discrepancies

If we compile the MAX8998 for a 64bit architecture we receive the following
warnings:

drivers/mfd/max8998.c: In function ‘max8998_i2c_get_driver_data’:
drivers/mfd/max8998.c:178:10:
warning: cast from pointer to integer of different size
return (int)match->data;
^

Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/max8998.c

···
 	return pd;
 }
 
-static inline int max8998_i2c_get_driver_data(struct i2c_client *i2c,
+static inline unsigned long max8998_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(max8998_dt_match, i2c->dev.of_node);
-		return (int)(long)match->data;
+		return (unsigned long)match->data;
 	}
 
-	return (int)id->driver_data;
+	return id->driver_data;
 }
 
 static int max8998_i2c_probe(struct i2c_client *i2c,

include/linux/mfd/max8998-private.h

···
 	int ono;
 	u8 irq_masks_cur[MAX8998_NUM_IRQ_REGS];
 	u8 irq_masks_cache[MAX8998_NUM_IRQ_REGS];
-	int type;
+	unsigned long type;
 	bool wakeup;
 };