Correct deserialisation

tests/powerloss_failpoints.h

@@ -96,9 +96,10 @@ public:
         {
             size_t len;
             s.read(reinterpret_cast<char*>(&len), sizeof(size_t));
-            char buf[len];
+            char buf[len+1];
             s.read(buf, len);
-            string file = buf;
+            buf[len] = 0;
+            string file(buf);
             size_t points;
             s.read(reinterpret_cast<char*>(&points), sizeof(size_t));
             cout << "File " << file << ": " << points << " points" << endl;
@@ -140,7 +141,7 @@ public:
     {
         if(visitedPoints.find(file) == visitedPoints.end())
         {   //new file
-            visitedPoints[file] = vector<VisitedWithLine>();
+            visitedPoints[string(file)] = vector<VisitedWithLine>();
         }
         if(visitedPoints[file].size() <= counter)
         {   //New point in file