Silent down compiler.

examples/nfc-mfultralight.c

@@ -110,7 +110,7 @@ write_card (void)
     page = 0x4;
   }
 
-  for (page; page <= 0xF; page++) {
+  for (; page <= 0xF; page++) {
     // Show if the readout went well
     if (bFailure) {
       // When a failure occured we need to redo the anti-collision

examples/nfc-sam.c

@@ -81,6 +81,8 @@ int main(int argc, const char* argv[])
 {
   nfc_device_t* pnd;
 
+  (void)(argc, argv);
+
   // Display libnfc version
   const char* acLibnfcVersion = nfc_version();
   printf("%s use libnfc %s\n", argv[0], acLibnfcVersion);

libnfc/drivers.h

@@ -82,7 +82,7 @@ static const struct driver_callbacks drivers_callbacks_list[] = {
 #  define PRINT_HEX(pcTag, pbtData, szBytes) do { \
     size_t __szPos; \
     printf(" %s: ", pcTag); \
-    for (__szPos=0; __szPos < szBytes; __szPos++) { \
+    for (__szPos=0; __szPos < (size_t)(szBytes); __szPos++) { \
       printf("%02x  ",pbtData[__szPos]); \
     } \
     printf("\n"); \