bench: Fix negative values and zero for -evals flag

Author: nijynot

src/bench/bench_bitcoin.cpp

@@ -51,6 +51,13 @@ int main(int argc, char** argv)
     std::string scaling_str = gArgs.GetArg("-scaling", DEFAULT_BENCH_SCALING);
     bool is_list_only = gArgs.GetBoolArg("-list", false);
 
+    if (evaluations == 0) {
+        return EXIT_SUCCESS;
+    } else if (evaluations < 0) {
+        tfm::format(std::cerr, "Error parsing evaluations argument: %d\n", evaluations);
+        return EXIT_FAILURE;
+    }
+
     double scaling_factor;
     if (!ParseDouble(scaling_str, &scaling_factor)) {
         tfm::format(std::cerr, "Error parsing scaling factor as double: %s\n", scaling_str.c_str());