Function JxlEncoderGetError 

pub unsafe extern "C" fn JxlEncoderGetError(
    enc: *mut JxlEncoder,
) -> JxlEncoderError

Get the (last) error code in case ::JXL_ENC_ERROR was returned.

@param enc encoder object. @return the @ref JxlEncoderError that caused the (last) ::JXL_ENC_ERROR to be returned.