Check the descriptor transport in the filter

The filter function should take into account the transports supported by
the device descriptor. If a transport isn't supported, the filter
function shouldn't indicate a match.

Author: jefdriesen

src/descriptor.c

@@ -1063,7 +1063,13 @@ dc_descriptor_get_transports (const dc_descriptor_t *descriptor)
 int
 dc_descriptor_filter (const dc_descriptor_t *descriptor, dc_transport_t transport, const void *userdata)
 {
-	if (descriptor == NULL || descriptor->filter == NULL || userdata == NULL)
+	if (descriptor == NULL)
+		return 1;
+
+	if ((descriptor->transports & transport) == 0)
+		return 0;
+
+	if (descriptor->filter == NULL || userdata == NULL)
 		return 1;
 
 	return descriptor->filter (descriptor, transport, userdata);