Fix test and examples to work with extended errors

Jan Breuer

2016-04-24 3a0d40729383c42af1cef194abc56182955fb9c9

 libscpi/src/error.c

@@ -123,9 +123,15 @@
}

static scpi_bool_t SCPI_ErrorAddInternal(scpi_t * context, int16_t err, char * info) {
    if (!fifo_add(&context->error_queue, err, info)) {
        fifo_remove_last(&context->error_queue, NULL);
        fifo_add(&context->error_queue, SCPI_ERROR_QUEUE_OVERFLOW, NULL);
    scpi_error_t error_value;
    error_value.error_code = err;
    error_value.device_dependent_info = info;
    if (!fifo_add(&context->error_queue, &error_value)) {
        fifo_remove_last(&context->error_queue, &error_value);
        // TODO free device_dependent_info
        error_value.error_code = SCPI_ERROR_QUEUE_OVERFLOW;
        error_value.device_dependent_info = NULL;
        fifo_add(&context->error_queue, &error_value);
        return FALSE;
    }
    return TRUE;