dont warn when system bus isnt found

playerctl/playerctl-common.c

@@ -209,7 +209,13 @@ GList *pctl_list_player_names_on_bus(GBusType bus_type, GError **err) {
             // incorrectly. I think we can pass through here because it is true
             // that there are no names on the bus that is supposed to be at
             // this socket path. But we need a better way of dealing with this case.
-            g_warning("D-Bus socket address not found, unable to list player names");
+            const gchar *message = "D-Bus socket address not found, unable to list player names";
+            if (bus_type == G_BUS_TYPE_SESSION) {
+                g_warning("%s", message);
+            } else {
+                g_debug("%s", message);
+            }
+
             g_clear_error(&tmp_error);
             return NULL;
         }

playerctl/playerctl-player.c

@@ -826,7 +826,7 @@ static void playerctl_player_init(PlayerctlPlayer *self) {
 
 /*
  * Get the matching bus name for this player name. Bus name will be like:
- * "org.mpris.MediaPlayer2.{PLAYER_NAME}[.instance{NUM}]"
+ * "org.mpris.MediaPlayer2.{PLAYER_NAME}[.{INSTANCE}]"
  * Pass a NULL player_name to get the first name on the bus
  * Returns NULL if no matching bus name is found on the bus.
  * Returns an error if there was a problem listing the names on the bus.