iio: pressure: dps310: consistently check return value of `regmap_read`

Align the check of return values `regmap_read` so that it's consistent
across this driver code.
Signed-off-by: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Link: https://lore.kernel.org/r/20240415105030.1161770-4-thomas.haemmerle@leica-geosystems.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/pressure/dps310.c

@@ -171,7 +171,7 @@ static int dps310_temp_workaround(struct dps310_data *data)
 	int reg;
 
 	rc = regmap_read(data->regmap, 0x32, &reg);
-	if (rc)
+	if (rc < 0)
 		return rc;
 
 	/*