USBHOST coding error resulting in spurious error message

tusbh_msg_root_enable()

res = -1;
while (res!=0){
res = tusbh_device_attach(dev);
TUSB_ROOT_INFO("Device attach failed\n");
}

This will cause a "Device attach failed" to always be printed, regardless of the outcome of the first device_attach() call.

I'll get around to a pull request, but this should be a quick fix. (working on getting USBHost more stable on Portenta Machine Control)

Locate tusbh_msg_root_enable() and inspect the shown tusbh_device_attach(dev) loop. Confirm the current output when the first attach succeeds, then make the completion condition match the intended error reporting. Done means "Device attach failed" is not printed after a successful first attach.

Written by the indexing model from the issue text.