gstreamer: gstbus: prevent locking a NULL-pointer
Calling GST_OBJECT_LOCK()
on a NULL-pointer leads to a segfault.
Returning from gst_bus_source_finalize()
in these cases is still
correct code but doesn't lead to segfaults!
Calling GST_OBJECT_LOCK()
on a NULL-pointer leads to a segfault.
Returning from gst_bus_source_finalize()
in these cases is still
correct code but doesn't lead to segfaults!