Clang-Tidy fixes (#6725)

(cherry picked from commit 3c501b963d)

test/testautomation.c

@@ -62,7 +62,7 @@ int main(int argc, char *argv[])
                 }
             } else if (SDL_strcasecmp(argv[i], "--execKey") == 0) {
                 if (argv[i + 1]) {
-                    SDL_sscanf(argv[i + 1], "%" SDL_PRIu64, &userExecKey);
+                    (void)SDL_sscanf(argv[i + 1], "%" SDL_PRIu64, &userExecKey);
                     consumed = 2;
                 }
             } else if (SDL_strcasecmp(argv[i], "--seed") == 0) {