usb/hcd: don't return 0 on error in usb_add_hcd()

If USB type detections fails, we run into default and return 0.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>