use g_free() instead of free()

On some platforms, g_free() must be used for memory allocated by
GLib.  This patch intends to correct a lot of occurrences, but is
probably not complete.

src/output/alsa_plugin.c

@@ -97,7 +97,7 @@ alsa_data_free(struct alsa_data *ad)
 {
 	g_free(ad->device);
 	mixer_free(ad->mixer);
-	free(ad);
+	g_free(ad);
 }
 
 static void

src/output/ao_plugin.c

@@ -131,7 +131,7 @@ audioOutputAo_initDriver(struct audio_output *ao,
 static void freeAoData(AoData * ad)
 {
 	ao_free_options(ad->options);
-	free(ad);
+	g_free(ad);
 }
 
 static void audioOutputAo_finishDriver(void *data)

src/output/jack_plugin.c

@@ -92,7 +92,7 @@ mpd_jack_free(struct jack_data *jd)
 	for (unsigned i = 0; i < G_N_ELEMENTS(jd->output_ports); ++i)
 		g_free(jd->output_ports[i]);
 
-	free(jd);
+	g_free(jd);
 }
 
 static void
@@ -275,7 +275,7 @@ mpd_jack_connect(struct jack_data *jd, struct audio_format *audio_format)
 				   jd->output_ports[0])) != 0 ) {
 			g_warning("%s is not a valid Jack Client / Port",
 				  jd->output_ports[0]);
-			free(port_name);
+			g_free(port_name);
 			return -1;
 		}
 		sprintf(port_name, "%s:right", name);
@@ -283,10 +283,10 @@ mpd_jack_connect(struct jack_data *jd, struct audio_format *audio_format)
 				   jd->output_ports[1])) != 0 ) {
 			g_warning("%s is not a valid Jack Client / Port",
 				  jd->output_ports[1]);
-			free(port_name);
+			g_free(port_name);
 			return -1;
 		}
-		free(port_name);
+		g_free(port_name);
 	}
 
 	return 1;

src/output/mvp_plugin.c

@@ -124,7 +124,7 @@ static void *mvp_initDriver(G_GNUC_UNUSED struct audio_output *audio_output,
 static void mvp_finishDriver(void *data)
 {
 	MvpData *md = data;
-	free(md);
+	g_free(md);
 }
 
 static int mvp_setPcmParams(MvpData * md, unsigned long rate, int channels,

src/output/oss_plugin.c

@@ -292,7 +292,7 @@ static void freeOssData(OssData * od)
 
 	mixer_free(od->mixer);
 
-	free(od);
+	g_free(od);
 }
 
 #define OSS_STAT_NO_ERROR 	0

src/output/osx_plugin.c

@@ -90,11 +90,10 @@ osx_initDriver(G_GNUC_UNUSED struct audio_output *audioOutput,
 
 static void freeOsxData(OsxData * od)
 {
-	if (od->buffer)
-		free(od->buffer);
+	g_free(od->buffer);
 	g_mutex_free(od->mutex);
 	g_cond_free(od->condition);
-	free(od);
+	g_free(od);
 }
 
 static void osx_finishDriver(void *data)

src/output/shout_plugin.c

@@ -81,7 +81,7 @@ static void free_shout_data(struct shout_data *sd)
 	if (sd->timer)
 		timer_free(sd->timer);
 
-	free(sd);
+	g_free(sd);
 }
 
 #define check_block_param(name) {		  \