usb: use int for completed to match libusb example code
usb: check for and use libusb_handle_events_timeout_completed
usb: added C enable for libusb check
cal: fixed typo that selects correct RX front-end in cal utils header (typo from copy-pasta still selected TX front-end)
Merge branch 'maint34' into maint
Merge branch 'maint'