ALSA: seq: ump: Use automatic cleanup of kfree()

There are common patterns where a temporary buffer is allocated and
freed at the exit, and those can be simplified with the recent cleanup
mechanism via __free(kfree).

No functional changes, only code refactoring.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240222111509.28390-9-tiwai@suse.de

sound/core/seq/seq_ump_client.c

@@ -217,15 +217,12 @@ static void fill_port_info(struct snd_seq_port_info *port,
 static int seq_ump_group_init(struct seq_ump_client *client, int group_index)
 {
 	struct seq_ump_group *group = &client->groups[group_index];
-	struct snd_seq_port_info *port;
+	struct snd_seq_port_info *port __free(kfree) = NULL;
 	struct snd_seq_port_callback pcallbacks;
-	int err;
 
 	port = kzalloc(sizeof(*port), GFP_KERNEL);
-	if (!port) {
-		err = -ENOMEM;
-		goto error;
-	}
+	if (!port)
+		return -ENOMEM;
 
 	fill_port_info(port, client, group);
 	port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
@@ -238,24 +235,22 @@ static int seq_ump_group_init(struct seq_ump_client *client, int group_index)
 	pcallbacks.unuse = seq_ump_unuse;
 	pcallbacks.event_input = seq_ump_process_event;
 	port->kernel = &pcallbacks;
-	err = snd_seq_kernel_client_ctl(client->seq_client,
-					SNDRV_SEQ_IOCTL_CREATE_PORT,
-					port);
- error:
-	kfree(port);
-	return err;
+	return snd_seq_kernel_client_ctl(client->seq_client,
+					 SNDRV_SEQ_IOCTL_CREATE_PORT,
+					 port);
 }
 
 /* update the sequencer ports; called from notify_fb_change callback */
 static void update_port_infos(struct seq_ump_client *client)
 {
-	struct snd_seq_port_info *old, *new;
+	struct snd_seq_port_info *old __free(kfree) = NULL;
+	struct snd_seq_port_info *new __free(kfree) = NULL;
 	int i, err;
 
 	old = kzalloc(sizeof(*old), GFP_KERNEL);
 	new = kzalloc(sizeof(*new), GFP_KERNEL);
 	if (!old || !new)
-		goto error;
+		return;
 
 	for (i = 0; i < SNDRV_UMP_MAX_GROUPS; i++) {
 		old->addr.client = client->seq_client;
@@ -264,7 +259,7 @@ static void update_port_infos(struct seq_ump_client *client)
 						SNDRV_SEQ_IOCTL_GET_PORT_INFO,
 						old);
 		if (err < 0)
-			goto error;
+			return;
 		fill_port_info(new, client, &client->groups[i]);
 		if (old->capability == new->capability &&
 		    !strcmp(old->name, new->name))
@@ -273,13 +268,10 @@ static void update_port_infos(struct seq_ump_client *client)
 						SNDRV_SEQ_IOCTL_SET_PORT_INFO,
 						new);
 		if (err < 0)
-			goto error;
+			return;
 		/* notify to system port */
 		snd_seq_system_client_ev_port_change(client->seq_client, i);
 	}
- error:
-	kfree(new);
-	kfree(old);
 }
 
 /* update dir_bits and active flag for all groups in the client */
@@ -334,7 +326,7 @@ static void update_group_attrs(struct seq_ump_client *client)
 /* create a UMP Endpoint port */
 static int create_ump_endpoint_port(struct seq_ump_client *client)
 {
-	struct snd_seq_port_info *port;
+	struct snd_seq_port_info *port __free(kfree) = NULL;
 	struct snd_seq_port_callback pcallbacks;
 	unsigned int rawmidi_info = client->ump->core.info_flags;
 	int err;
@@ -383,7 +375,6 @@ static int create_ump_endpoint_port(struct seq_ump_client *client)
 	err = snd_seq_kernel_client_ctl(client->seq_client,
 					SNDRV_SEQ_IOCTL_CREATE_PORT,
 					port);
-	kfree(port);
 	return err;
 }