We should only dereference "data" after we check if it is an error

Fixes: 54187ff9d766 ('hwmon: (max31790) Convert to use new hwmon registration 
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index bef84e0..c1b9275 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -268,11 +268,13 @@ static int max31790_read_pwm(struct device *dev, u32 
attr, int channel,
                             long *val)
        struct max31790_data *data = max31790_update_device(dev);
-       u8 fan_config = data->fan_config[channel];
+       u8 fan_config;
        if (IS_ERR(data))
                return PTR_ERR(data);
+       fan_config = data->fan_config[channel];
        switch (attr) {
        case hwmon_pwm_input:
                *val = data->pwm[channel] >> 8;
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