[Pcsclite-muscle] ccid_usb.c error handling

[Hendrik]

Hello,

i wondered about the error handling in the ReadUSB()/WriteUSB()
functions in ccid_usb.c.

After the call to libusb_bulk_transfer errno is checked and
strerror(errno) printed to the log, resulting in confusing logs because
the return value of libusb_bulk_transfer might indicate an error but
strerror(errno) returns 'Success'.

The libusb 1.0 API documentation does not mention that errno is set by
libusb_bulk_transfer, so don't use it.

The attached patch should clean that up and is compile tested.

Best regards,
Hendrik

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