[ALSA]: Add some missing includes.

include/sound/rawmidi.h

@@ -23,6 +23,9 @@
  */
 
 #include <sound/asound.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <asm/semaphore.h>
 
 #if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
 #include "seq_device.h"

sound/core/device.c

@@ -23,6 +23,7 @@
 #include <sound/driver.h>
 #include <linux/slab.h>
 #include <linux/time.h>
+#include <linux/errno.h>
 #include <sound/core.h>
 
 int snd_device_new(snd_card_t *card, snd_device_type_t type,

sound/core/seq/seq_midi.c

@@ -30,6 +30,7 @@ Possible options for midisynth module:
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/string.h>
 #include <asm/semaphore.h>
 #include <sound/core.h>
 #include <sound/rawmidi.h>

sound/core/seq/seq_midi_event.c

@@ -22,6 +22,7 @@
 #include <sound/driver.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/string.h>
 #include <sound/core.h>
 #include <sound/seq_kernel.h>
 #include <sound/seq_midi_event.h>