quick_start_example1.c: avoid using warnx() to remove err.h dependency

err.h is not available under Windows and the goal of this example is not to learn how to get around that problem ;)

ChangeLog

@@ -29,6 +29,7 @@ Improvements:
  - Windows: logging via OutputDebugString(), ease debugging
  - nfc-mfclassic: use smaller files for cards < 4k
  - nfc-mfclassic: by defaut don't authorise wrong keyfile, use "f" to force
+ - quick_start_example1.c: remove err.h dependency, easier for Windowsians
 
 Changes:
  - Upon malloc error, nfc_init() doesn't force exit() anymore

examples/doc/quick_start_example1.c

@@ -6,12 +6,7 @@
 // To compile this simple example:
 // $ gcc -o quick_start_example1 quick_start_example1.c -lnfc
 
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif // HAVE_CONFIG_H
-
 #include <stdlib.h>
-#include <err.h>
 #include <nfc/nfc.h>
 
 static void
@@ -37,7 +32,7 @@ main(int argc, const char *argv[])
   // Initialize libnfc and set the nfc_context
   nfc_init(&context);
   if (context == NULL) {
-    warnx("Unable to init libnfc (malloc)\n");
+    printf("Unable to init libnfc (malloc)\n");
     exit(EXIT_FAILURE);
   }
 
@@ -53,7 +48,7 @@ main(int argc, const char *argv[])
   pnd = nfc_open(context, NULL);
 
   if (pnd == NULL) {
-    warnx("ERROR: %s", "Unable to open NFC device.");
+    printf("ERROR: %s", "Unable to open NFC device.");
     exit(EXIT_FAILURE);
   }
   // Set opened NFC device to initiator mode