Clang-Tidy fixes (#6725)

(cherry picked from commit 3c501b963d)

test/testyuv.c

@@ -436,7 +436,7 @@ int main(int argc, char **argv)
             if (current == 0) {
                 SDLTest_DrawString(renderer, 4, 4, titles[current]);
             } else {
-                SDL_snprintf(title, sizeof(title), "%s %s %s", titles[current], yuv_name, yuv_mode);
+                (void)SDL_snprintf(title, sizeof title, "%s %s %s", titles[current], yuv_name, yuv_mode);
                 SDLTest_DrawString(renderer, 4, 4, title);
             }
             SDL_RenderPresent(renderer);