gen_usb_descriptor: Fix off-by-1 error in endpoint counting

Author: jepler

tools/gen_usb_descriptor.py

@@ -382,8 +382,9 @@ def strings_in_order(cls):
     for interface in interfaces:
         for subdescriptor in interface.subdescriptors:
             endpoint_address = getattr(subdescriptor, 'bEndpointAddress', 0) & 0x7f
-            if endpoint_address > args.max_ep:
-                raise ValueError("Endpoint address %d of %s may not exceed %d" % (endpoint_address & 0x7f, interface.description, args.max_ep))
+            print("Endpoint %d - vs max_ep %d" % (endpoint_address, args.max_ep))
+            if endpoint_address >= args.max_ep:
+                raise ValueError("Endpoint address %d of %s must be less than %d" % (endpoint_address & 0x7f, interface.description, args.max_ep))
 else:
     print("Unable to check whether maximum number of endpoints is respected", file=sys.stderr)