bus: in bus_foreach_bus() don't bother with api_bus if it is NULL

Let's better be safe than sorry, and validate that api_bus is not NULL
before we send messages to it. Of course, strictly speaking this
shouldn't actually be necessary, as the tracker object should not exist
without the bus, but let's be extra sure.

diff --git a/src/core/dbus.c b/src/core/dbus.c
index c7c96a3409869c7c0f8c748caf3f9d3c3ed55e86..04bed73b65322f201ebf61f8e45c81bebe5d4a19 100644 (file)
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -1204,8 +1204,9 @@ int bus_foreach_bus(
         }
 
         /* Send to API bus, but only if somebody is subscribed */
-        if (sd_bus_track_count(m->subscribed) > 0 ||
-            sd_bus_track_count(subscribed2) > 0) {
+        if (m->api_bus &&
+            (sd_bus_track_count(m->subscribed) > 0 ||
+             sd_bus_track_count(subscribed2) > 0)) {
                 r = send_message(m->api_bus, userdata);
                 if (r < 0)
                         ret = r;