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);