add parentheses for clarity (#2999)

Author: jmklix

tests/benchmark/benchmark.cpp

@@ -11,7 +11,7 @@
 
 int main(int argc, char *argv[]) {
     if (1 == argc ||
-        2 == argc && (std::string(argv[1]) == "-h" || std::string(argv[1]) == "--help" ))
+        (2 == argc && (std::string(argv[1]) == "-h" || std::string(argv[1]) == "--help" )))
     {
         Benchmark::Configuration::PrintHelp();
         return 0;