Merge pull request 'usb: properly count the number of opened interfaces' (#48) from lda/gint-test:descriptormoment into dev

Reviewed-on: https://git.planet-casio.com/Lephenixnoir/gint/pulls/48

src/usb/setup.c

@@ -138,8 +138,9 @@ static void write_configuration_descriptor(int wLength)
 {
 	usb_interface_t const * const *interfaces = usb_configure_interfaces();
 	size_t total_length = sizeof(usb_dc_configuration_t);
+    size_t interface_count = 0;
 
-	for(int i = 0; interfaces[i]; i++)
+	for(int i = 0; interfaces[i]; i++, interface_count++)
 	for(int k = 0; interfaces[i]->dc[k]; k++)
 	{
 		uint8_t const *dc = interfaces[i]->dc[k];
@@ -149,6 +150,7 @@ static void write_configuration_descriptor(int wLength)
 
 	/* Write the configuration descriptor */
 	dc_configuration.wTotalLength = htole16(total_length);
+    dc_configuration.bNumInterfaces = interface_count;
 	dcp_write(&dc_configuration, dc_configuration.bLength);
 	/* For the first call, the host usually wants only this */
 	if(wLength <= dc_configuration.bLength) return;