Fixed deepcode-ci warnings

Author: sea5kg

src/wsjcpp_yaml.cpp

@@ -1144,7 +1144,7 @@ int WsjcppYamlCursor::valInt() {
     if (m_pCurrentNode != nullptr) {
         std::string sValue = m_pCurrentNode->getValue();
         sValue = WsjcppCore::toLower(sValue);
-        int nValue = std::atoi(sValue.c_str());
+        int nValue = std::strtol(sValue.c_str(), nullptr, 10);
         if (std::to_string(nValue) != sValue) {
             throw std::runtime_error(TAG + ": valInt, Element must be int but have a string" + m_pCurrentNode->getForLogFormat());
         }

unit-tests.wsjcpp/src/process_mem_usage.h

@@ -25,6 +25,9 @@ void process_mem_usage(double& vm_usage, double& resident_set)
    // 'file' stat seems to give the most reliable results
    //
    ifstream stat_stream("/proc/self/stat",ios_base::in);
+   if (!stat_stream.is_open()) {
+      return;
+   }
 
    // dummy vars for leading entries in stat that we don't care about
    //