output_all: audio_output_all_update() returns bool

audio_output_all_update() returns true when there is at least open
output device which is open.

src/output_all.c

@@ -163,16 +163,25 @@ audio_output_all_reset_reopen(void)
 	}
 }
 
-static void
+/**
+ * Opens all output devices which are enabled, but closed.
+ *
+ * @return true if there is at least open output device which is open
+ */
+static bool
 audio_output_all_update(void)
 {
 	unsigned int i;
+	bool ret = false;
 
 	if (!audio_format_defined(&input_audio_format))
-		return;
+		return false;
 
 	for (i = 0; i < num_audio_outputs; ++i)
-		audio_output_update(&audio_outputs[i], &input_audio_format);
+		ret = ret || audio_output_update(&audio_outputs[i],
+						 &input_audio_format);
+
+	return ret;
 }
 
 bool

src/output_control.c

@@ -94,16 +94,18 @@ audio_output_open(struct audio_output *ao,
 	return ao->open;
 }
 
-void
+bool
 audio_output_update(struct audio_output *ao,
 		    const struct audio_format *audio_format)
 {
 	if (ao->enabled) {
 		if (ao->fail_timer == NULL ||
 		    g_timer_elapsed(ao->fail_timer, NULL) > REOPEN_AFTER)
-			audio_output_open(ao, audio_format);
+			return audio_output_open(ao, audio_format);
 	} else if (audio_output_is_open(ao))
 		audio_output_close(ao);
+
+	return false;
 }
 
 void

src/output_control.h

@@ -45,8 +45,10 @@ audio_output_open(struct audio_output *ao,
 
 /**
  * Opens or closes the device, depending on the "enabled" flag.
+ *
+ * @return true if the device is open
  */
-void
+bool
 audio_output_update(struct audio_output *ao,
 		    const struct audio_format *audio_format);