ALSA: firewire-tascam: remove callback function from async midi port

As a result of localization of async midi port, ALSA driver for TASCAM
FireWire series can call helper function directly instead of callback
registration.

This commit removes the redundant design.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-transaction.c

@@ -197,7 +197,7 @@ static void midi_port_work(struct work_struct *work)
 	 * Later, snd_rawmidi_transmit_ack() is called.
 	 */
 	memset(port->buf, 0, port->len);
-	port->consume_bytes = port->fill(substream, port->buf);
+	port->consume_bytes = fill_message(substream, port->buf);
 	if (port->consume_bytes <= 0) {
 		/* Do it in next chance, immediately. */
 		if (port->consume_bytes == 0) {
@@ -242,8 +242,7 @@ static void midi_port_work(struct work_struct *work)
 }
 
 int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
-		struct fw_unit *unit, u64 addr, unsigned int len,
-		snd_fw_async_midi_port_fill fill)
+		struct fw_unit *unit, u64 addr, unsigned int len)
 {
 	port->len = DIV_ROUND_UP(len, 4) * 4;
 	port->buf = kzalloc(port->len, GFP_KERNEL);
@@ -252,7 +251,6 @@ int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
 
 	port->parent = fw_parent_device(unit);
 	port->addr = addr;
-	port->fill = fill;
 	port->idling = true;
 	port->next_ktime = 0;
 	port->error = false;
@@ -347,7 +345,7 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
 		err = snd_fw_async_midi_port_init(
 				&tscm->out_ports[i], tscm->unit,
 				TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_RX_QUAD,
-				4, fill_message);
+				4);
 		if (err < 0)
 			goto error;
 	}

sound/firewire/tascam/tascam.h

@@ -45,11 +45,6 @@ struct snd_tscm_spec {
 #define TSCM_MIDI_IN_PORT_MAX	4
 #define TSCM_MIDI_OUT_PORT_MAX	4
 
-struct snd_fw_async_midi_port;
-typedef int (*snd_fw_async_midi_port_fill)(
-				struct snd_rawmidi_substream *substream,
-				u8 *buf);
-
 struct snd_fw_async_midi_port {
 	struct fw_device *parent;
 	struct work_struct work;
@@ -64,7 +59,6 @@ struct snd_fw_async_midi_port {
 	unsigned int len;
 
 	struct snd_rawmidi_substream *substream;
-	snd_fw_async_midi_port_fill fill;
 	int consume_bytes;
 };
 
@@ -155,8 +149,7 @@ int snd_tscm_stream_lock_try(struct snd_tscm *tscm);
 void snd_tscm_stream_lock_release(struct snd_tscm *tscm);
 
 int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
-		struct fw_unit *unit, u64 addr, unsigned int len,
-		snd_fw_async_midi_port_fill fill);
+		struct fw_unit *unit, u64 addr, unsigned int len);
 void snd_fw_async_midi_port_destroy(struct snd_fw_async_midi_port *port);
 
 static inline void