conf: const pointers in block get functions

All config_get_block_*() functions should accept constant config_param
pointers.

src/output/alsa_plugin.c

@@ -108,7 +108,7 @@ alsa_data_free(struct alsa_data *ad)
 }
 
 static void
-alsa_configure(struct alsa_data *ad, struct config_param *param)
+alsa_configure(struct alsa_data *ad, const struct config_param *param)
 {
 	ad->device = config_dup_block_string(param, "device", NULL);
 
@@ -138,7 +138,7 @@ alsa_configure(struct alsa_data *ad, struct config_param *param)
 static void *
 alsa_init(G_GNUC_UNUSED struct audio_output *ao,
 	  G_GNUC_UNUSED const struct audio_format *audio_format,
-	  struct config_param *param)
+	  const struct config_param *param)
 {
 	/* no need for pthread_once thread-safety when reading config */
 	static int free_global_registered;

src/output/ao_plugin.c

@@ -77,7 +77,7 @@ static void audioOutputAo_error(const char *msg)
 static void *
 audioOutputAo_initDriver(struct audio_output *ao,
 			 G_GNUC_UNUSED const struct audio_format *audio_format,
-			 struct config_param *param)
+			 const struct config_param *param)
 {
 	ao_info *ai;
 	AoData *ad = newAoData();

src/output/fifo_plugin.c

@@ -161,7 +161,7 @@ static bool openFifo(FifoData *fd)
 
 static void *fifo_initDriver(G_GNUC_UNUSED struct audio_output *ao,
 			     G_GNUC_UNUSED const struct audio_format *audio_format,
-			     struct config_param *param)
+			     const struct config_param *param)
 {
 	FifoData *fd;
 	char *value, *path;

src/output/jack_plugin.c

@@ -183,7 +183,7 @@ mpd_jack_error(const char *msg)
 static void *
 mpd_jack_init(struct audio_output *ao,
 	      G_GNUC_UNUSED const struct audio_format *audio_format,
-	      struct config_param *param)
+	      const struct config_param *param)
 {
 	struct jack_data *jd;
 	const char *value;

src/output/mvp_plugin.c

@@ -112,7 +112,7 @@ static bool mvp_testDefault(void)
 
 static void *mvp_initDriver(G_GNUC_UNUSED struct audio_output *audio_output,
 			    G_GNUC_UNUSED const struct audio_format *audio_format,
-			    G_GNUC_UNUSED struct config_param *param)
+			    G_GNUC_UNUSED const struct config_param *param)
 {
 	MvpData *md = g_new(MvpData, 1);
 	md->audio_output = audio_output;

src/output/null_plugin.c

@@ -32,7 +32,7 @@ struct null_data {
 static void *
 null_init(G_GNUC_UNUSED struct audio_output *audio_output,
 	  G_GNUC_UNUSED const struct audio_format *audio_format,
-	  G_GNUC_UNUSED struct config_param *param)
+	  G_GNUC_UNUSED const struct config_param *param)
 {
 	struct null_data *nd = g_new(struct null_data, 1);
 

src/output/oss_plugin.c

@@ -344,7 +344,7 @@ static bool oss_testDefault(void)
 	return false;
 }
 
-static void *oss_open_default(struct config_param *param)
+static void *oss_open_default(const struct config_param *param)
 {
 	int i;
 	int err[G_N_ELEMENTS(default_devices)];
@@ -390,7 +390,7 @@ static void *oss_open_default(struct config_param *param)
 static void *
 oss_initDriver(G_GNUC_UNUSED struct audio_output *audioOutput,
 	       G_GNUC_UNUSED const struct audio_format *audio_format,
-	       struct config_param *param)
+	       const struct config_param *param)
 {
 	if (param) {
 		const char *device =

src/output/osx_plugin.c

@@ -83,7 +83,7 @@ static bool osx_testDefault(void)
 static void *
 osx_initDriver(G_GNUC_UNUSED struct audio_output *audioOutput,
 	       G_GNUC_UNUSED const struct audio_format *audio_format,
-	       G_GNUC_UNUSED struct config_param *param)
+	       G_GNUC_UNUSED const struct config_param *param)
 {
 	return newOsxData();
 }

src/output/pulse_plugin.c

@@ -55,7 +55,7 @@ static void pulse_free_data(struct pulse_data *pd)
 static void *
 pulse_init(struct audio_output *ao,
 	   G_GNUC_UNUSED const struct audio_format *audio_format,
-	   struct config_param *param)
+	   const struct config_param *param)
 {
 	struct pulse_data *pd;
 

src/output/shout_plugin.c

@@ -94,7 +94,7 @@ static void free_shout_data(struct shout_data *sd)
 
 static void *my_shout_init_driver(struct audio_output *audio_output,
 				  const struct audio_format *audio_format,
-				  struct config_param *param)
+				  const struct config_param *param)
 {
 	struct shout_data *sd;
 	char *test;