Pointer as bool (libsdl-org#7214)

test/testplatform.c

@@ -365,7 +365,7 @@ static int Test64Bit(SDL_bool verbose)
     LL_Test *t;
     int failed = 0;
 
-    for (t = LL_Tests; t->routine != NULL; t++) {
+    for (t = LL_Tests; t->routine; t++) {
         unsigned long long result = 0;
         unsigned int *al = (unsigned int *)&t->a;
         unsigned int *bl = (unsigned int *)&t->b;
@@ -447,7 +447,7 @@ int main(int argc, char *argv[])
 
     /* Initialize test framework */
     state = SDLTest_CommonCreateState(argv, 0);
-    if (state == NULL) {
+    if (!state) {
         return 1;
     }