Jochen Hoenicke a4f1568b7d stmfx07: usb: flush txfifo if not empty after SETUP ...

After a SETUP packet on a control endpoint the transmit FIFO
should usually be empty.  If something bad happened, e.g. PC
and device got out of sync, we want to clear the fifo.
This should fix #668.

2017-03-30 21:48:07 +00:00

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