darwin: ignore root hub simulation devices

This commit fixes #108. In the 10.11.0 release it can take up to 1
second to query the configuration of one of Apple's root hub
simulation devices. Since the devices are not usable anyway go ahead
and mark them as unconfigured.

Signed-off-by: Nathan Hjelm <hjelmn@me.com>

libusb/os/darwin_usb.c

@@ -570,6 +570,14 @@ static int darwin_check_configuration (struct libusb_context *ctx, struct darwin
     return LIBUSB_ERROR_OTHER; /* no configurations at this speed so we can't use it */
   }
 
+  /* checking the configuration of a root hub simulation takes ~1 s in 10.11. the device is
+     not usable anyway */
+  if (0x05ac == dev->dev_descriptor.idVendor && 0x8005 == dev->dev_descriptor.idProduct) {
+    usbi_dbg ("ignoring configuration on root hub simulation");
+    dev->active_config = 0;
+    return 0;
+  }
+
   /* find the first configuration */
   kresult = (*darwin_device)->GetConfigurationDescriptorPtr (darwin_device, 0, &configDesc);
   dev->first_config = (kIOReturnSuccess == kresult) ? configDesc->bConfigurationValue : 1;
@@ -1275,7 +1283,7 @@ static int darwin_release_interface(struct libusb_device_handle *dev_handle, int
   if (kresult != kIOReturnSuccess)
     usbi_warn (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
 
-  cInterface->interface = IO_OBJECT_NULL;
+  cInterface->interface = (usb_interface_t **) IO_OBJECT_NULL;
 
   return darwin_to_libusb (kresult);
 }

libusb/version_nano.h

@@ -1 +1 @@
-#define LIBUSB_NANO 11013
+#define LIBUSB_NANO 11014