TestDriver: fix/silence clang-tidy warnings

Templates/TestDriver.cxx.in

-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <ctype.h>  /* NOLINT */
+#include <stdio.h>  /* NOLINT */
+#include <stdlib.h> /* NOLINT */
+#include <string.h> /* NOLINT */
 
 #if defined(_MSC_VER)
 #pragma warning(disable : 4996) /* deprecation */
@@ -29,7 +29,7 @@ typedef struct
 
 static functionMapEntry cmakeGeneratedFunctionMapEntries[] = {
   @CMAKE_FUNCTION_TABLE_ENTIRES@
-  { 0, 0 }
+  { NULL, NULL } /* NOLINT */
 };
 
 static const int NumTests =
@@ -37,7 +37,6 @@ static const int NumTests =
 
 /* Allocate and create a lowercased copy of string
    (note that it has to be free'd manually) */
-
 static char* lowercase(const char* string)
 {
   char *new_string, *p;
@@ -46,8 +45,8 @@ static char* lowercase(const char* string)
   stringSize = CM_CAST(size_t, strlen(string) + 1);
   new_string = CM_CAST(char*, malloc(sizeof(char) * stringSize));
 
-  if (!new_string) {
-    return 0;
+  if (new_string == NULL) { /* NOLINT */
+    return NULL;            /* NOLINT */
   }
   strncpy(new_string, string, stringSize);
   for (p = new_string; *p != 0; ++p) {
@@ -87,12 +86,12 @@ int main(int ac, char* av[])
     av++;
   }
   partial_match = 0;
-  arg = 0;
+  arg = NULL; /* NOLINT */
   /* If partial match is requested.  */
   if (testToRun == -1 && ac > 1) {
     partial_match = (strcmp(av[1], "-R") == 0) ? 1 : 0;
   }
-  if (partial_match && ac < 3) {
+  if (partial_match != 0 && ac < 3) {
     printf("-R needs an additional parameter.\n");
     return -1;
   }
@@ -101,20 +100,18 @@ int main(int ac, char* av[])
   }
   for (i = 0; i < NumTests && testToRun == -1; ++i) {
     test_name = lowercase(cmakeGeneratedFunctionMapEntries[i].name);
-    if (partial_match && strstr(test_name, arg) != NULL) {
+    if (partial_match != 0 && strstr(test_name, arg) != NULL) { /* NOLINT */
       testToRun = i;
       ac -= 2;
       av += 2;
-    } else if (!partial_match && strcmp(test_name, arg) == 0) {
+    } else if (partial_match == 0 && strcmp(test_name, arg) == 0) {
       testToRun = i;
       ac--;
       av++;
     }
     free(test_name);
   }
-  if (arg) {
-    free(arg);
-  }
+  free(arg);
   if (testToRun != -1) {
     int result;
 @CMAKE_TESTDRIVER_BEFORE_TESTMAIN@