Calls to libusb_bulk_transfer() don't check for LIBUSB_ERROR_TIMEOUT

[Kyle Schwarz <kschwarz@xxxxxxxxxxxxxx>]

In ftdi.c there are calls to libusb_bulk_transfer(), but they don't check for a possible LIBUSB_ERROR_TIMEOUT.

A LIBUSB_ERROR_TIMEOUT isn't technically an error and shouldn't be handled as such.

The docs for libusb describe this fairly well, but let me know if more information is needed to fix this.

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