firmware: arm_scmi: replace of_match_device->data with of_device_get_match_data()

of_match_device can return NULL if no matching device is found though
it's highly unlikely to happen in scmi_probe as it's called only if
a valid match is found.

However we can use of_device_get_match_data() instead of
of_match_device()->data to handle NULL pointer checks and return -EINVAL
in such a scenario.
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/driver.c

@@ -796,7 +796,9 @@ static int scmi_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	desc = of_match_device(scmi_of_match, dev)->data;
+	desc = of_device_get_match_data(dev);
+	if (!desc)
+		return -EINVAL;
 
 	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 	if (!info)