hwmon: (ibmaem) match return type of wait_for_completion_timeout

Return type of wait_for_completion_timeout is unsigned long not int.
Check its return value inline instead of introducing a throw-away
variable.

Reviewed-by: Mimi Zohar <[e-mail]>
Signed-off-by: Qiushi Wu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/ibmaem.c

···
 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
 			   void *buf, size_t size)
 {
-	int rs_size, res;
+	int rs_size;
 	struct aem_read_sensor_req rs_req;
 	/* Use preallocated rx buffer */
 	struct aem_read_sensor_resp *rs_resp = data->rs_resp;
···
 
 	aem_send_message(ipmi);
 
-	res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
-	if (!res) {
-		res = -ETIMEDOUT;
-		goto out;
-	}
+	if (!wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT))
+		return -ETIMEDOUT;
 
 	if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
-	    memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
-		res = -ENOENT;
-		goto out;
-	}
+	    memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id)))
+		return -ENOENT;
 
 	switch (size) {
 	case 1: {
···
 		break;
 	}
 	}
-	res = 0;
 
-out:
-	return res;
+	return 0;
 }
 
 /* Update AEM energy registers */
···
 /* Retrieve version and module handle for an AEM1 instance */
 static int aem_find_aem1_count(struct aem_ipmi_data *data)
 {
-	int res;
 	struct aem_find_firmware_req	ff_req;
 	struct aem_find_firmware_resp	ff_resp;
 
···
 
 	aem_send_message(data);
 
-	res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
-	if (!res)
+	if (!wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT))
 		return -ETIMEDOUT;
 
 	if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
···
 			    struct aem_find_instance_resp *fi_resp,
 			    int instance_num)
 {
-	int res;
 	struct aem_find_instance_req fi_req;
 
 	fi_req.id = system_x_id;
···
 
 	aem_send_message(data);
 
-	res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
-	if (!res)
+	if (!wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT))
 		return -ETIMEDOUT;
 
 	if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||