fix pio_usb_bus_wait_handshake() exit before EOP #176
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This fixed and issue introduced by #164 where pio_usb_bus_wait_handshake() could exit before EOP is received, this cause race condition as result mouting some device especially Lowspeed attached directly (without hub).
I also check the SYNC before return the handshake as well, that would simplify the caller check
related issue:
PS: if possible a minor version bump would be great for Arduino user.