HID: prodikeys: make needlessly global symbols static

The following symbols are not referenced outside this file so
there's no need for it to be in the global name space.

  pcmidi_sustained_note_release
  init_sustain_timers
  stop_sustain_timers
  pcmidi_handle_report
  pcmidi_setup_extra_keys
  pcmidi_snd_initialise
  pcmidi_snd_terminate

Make them static.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-prodikeys.c

@@ -242,15 +242,15 @@ static void pcmidi_send_note(struct pcmidi_snd *pm,
 	return;
 }
 
-void pcmidi_sustained_note_release(unsigned long data)
+static void pcmidi_sustained_note_release(unsigned long data)
 {
 	struct pcmidi_sustain *pms = (struct pcmidi_sustain *)data;
 
 	pcmidi_send_note(pms->pm, pms->status, pms->note, pms->velocity);
 	pms->in_use = 0;
 }
 
-void init_sustain_timers(struct pcmidi_snd *pm)
+static void init_sustain_timers(struct pcmidi_snd *pm)
 {
 	struct pcmidi_sustain *pms;
 	unsigned i;
@@ -264,7 +264,7 @@ void init_sustain_timers(struct pcmidi_snd *pm)
 	}
 }
 
-void stop_sustain_timers(struct pcmidi_snd *pm)
+static void stop_sustain_timers(struct pcmidi_snd *pm)
 {
 	struct pcmidi_sustain *pms;
 	unsigned i;
@@ -499,7 +499,7 @@ static int pcmidi_handle_report4(struct pcmidi_snd *pm, u8 *data)
 	return 1;
 }
 
-int pcmidi_handle_report(
+static int pcmidi_handle_report(
 	struct pcmidi_snd *pm, unsigned report_id, u8 *data, int size)
 {
 	int ret = 0;
@@ -518,7 +518,8 @@ int pcmidi_handle_report(
 	return ret;
 }
 
-void pcmidi_setup_extra_keys(struct pcmidi_snd *pm, struct input_dev *input)
+static void pcmidi_setup_extra_keys(
+	struct pcmidi_snd *pm, struct input_dev *input)
 {
 	/* reassigned functionality for N/A keys
 		MY PICTURES =>	KEY_WORDPROCESSOR
@@ -602,7 +603,7 @@ static struct snd_rawmidi_ops pcmidi_in_ops = {
 	.trigger = pcmidi_in_trigger
 };
 
-int pcmidi_snd_initialise(struct pcmidi_snd *pm)
+static int pcmidi_snd_initialise(struct pcmidi_snd *pm)
 {
 	static int dev;
 	struct snd_card *card;
@@ -720,7 +721,7 @@ int pcmidi_snd_initialise(struct pcmidi_snd *pm)
 	return err;
 }
 
-int pcmidi_snd_terminate(struct pcmidi_snd *pm)
+static int pcmidi_snd_terminate(struct pcmidi_snd *pm)
 {
 	if (pm->card) {
 		stop_sustain_timers(pm);