Disable pn53x_check_communication: Input / Output Error message - c

Question

I'm using libnfc 1.7.1 compiled with c to read from a PN532 reader on a Raspberry Pi. The goal is to make a node for Node-RED that injects the UID of the scanned card or pass errors along about library or reader. I modified the example to give me the UID of a card as the only normal output. I can't have anything printed other than an error when the library can't be loaded, an error when the reader can't be connected, or the UID of the card. I changed the log level to 0 in /etc/nfc/libnfc.conf but my program is still printing "pn53x_check_communication: Input / Output Error" (unwanted) as well as "ERROR: Unable to open NFC device." (wanted) I can't find any way to disable the I/O error message. I looked in the library and found this that returns NFC_EIO which is the I/O error I'm getting, but can't find anywhere that it actually prints that. Short of modifying the library I can't find any way to disable this print. If there is nothing that can be done I can program my node to ignore this output but I would rather eliminate it. My code is below:
#include <stdlib.h>
#include <nfc/nfc.h>
static void
print_long(const uint8_t *pbtData, const size_t szBytes)
{
size_t szPos;
for (szPos = 0; szPos < szBytes; szPos++) {
printf("%03lu", pbtData[szPos]);
}
printf("\n");
}
int
main(int argc, const char *argv[])
{
nfc_device *pnd;
nfc_target nt;
// Allocate only a pointer to nfc_context
nfc_context *context;
// Initialize libnfc and set the nfc_context
nfc_init(&context);
if (context == NULL) {
printf("Unable to init libnfc (malloc)\n");
exit(EXIT_FAILURE);
}
// Open, using the first available NFC device which can be in order of selection:
// - default device specified using environment variable or
// - first specified device in libnfc.conf (/etc/nfc) or
// - first specified device in device-configuration directory (/etc/nfc/devices.d) or
// - first auto-detected (if feature is not disabled in libnfc.conf) device
pnd = nfc_open(context, NULL);
//Send error
if (pnd == NULL) {
printf("ERROR: %s\n", "Unable to open NFC device.");
exit(EXIT_FAILURE);
}
// Set opened NFC device to initiator mode
if (nfc_initiator_init(pnd) < 0) {
nfc_perror(pnd, "nfc_initiator_init");
exit(EXIT_FAILURE);
}
while(true){
// Poll for a ISO14443A (MIFARE) tag
const nfc_modulation nmMifare = {
.nmt = NMT_ISO14443A,
.nbr = NBR_106,
};
//Print decimal version of UID and wait until it's removed to scan again
if (nfc_initiator_select_passive_target(pnd, nmMifare, NULL, 0, &nt) > 0) {
print_long(nt.nti.nai.abtUid, nt.nti.nai.szUidLen);
while (0 == nfc_initiator_target_is_present(pnd, NULL)) {}
}
}
}