Base: avoid const_cast in FileInfo

src/Base/FileInfo.cpp

@@ -181,11 +181,18 @@ std::string FileInfo::getTempFileName(const char* FileName, const char* Path)
         buf += "/fileXXXXXX";
     }
 
+    std::vector<char> vec;
+    std::copy(buf.begin(), buf.end(), std::back_inserter(vec));
+    vec.push_back('\0');
+
     /* coverity[secure_temp] mkstemp uses 0600 as the mode and is safe */
-    int id = mkstemp(const_cast<char*>(buf.c_str()));
+    int id = mkstemp(vec.data());
     if (id > -1) {
         FILE* file = fdopen(id, "w");
         fclose(file);
+        vec.pop_back(); // remove '\0'
+        std::string str(vec.begin(), vec.end());
+        buf.swap(str);
         unlink(buf.c_str());
     }
     return buf;