training: Replace NULL by nullptr

Signed-off-by: Stefan Weil <[email protected]>

Author: stweil

training/cntraining.cpp

@@ -164,7 +164,7 @@ int main(int argc, char *argv[]) {
     Clusterer =
       SetUpForClustering(FeatureDefs, CharSample, PROGRAM_FEATURE_TYPE);
     if (Clusterer == nullptr) {  // To avoid a SIGSEGV
-      fprintf(stderr, "Error: NULL clusterer!\n");
+      fprintf(stderr, "Error: nullptr clusterer!\n");
       return 1;
     }
     float SavedMinSamples = Config.MinSamples;

training/tessopt.cpp

@@ -41,7 +41,7 @@ const char *arglist                    //string of arg chars
     tessoptind = 1;
   if (tessoptind < argc && argv[tessoptind][0] == '-') {
     arg = strchr (arglist, argv[tessoptind][1]);
-    if (arg == NULL || *arg == ':')
+    if (arg == nullptr || *arg == ':')
       return '?';                //dud option
     tessoptind++;
     tessoptarg = argv[tessoptind];