[code] fix logs in main (string -> cstring)

src/main.cpp

@@ -317,11 +317,11 @@ int main(int argc, char ** argv)
 
         if (what == "Connection lost")
         {
-            LOG_F(ERROR, "%s", what);
+            LOG_F(ERROR, "%s", what.c_str());
         }
         else
         {
-            LOG_F(ERROR, "%s", what);
+            LOG_F(ERROR, "%s", what.c_str());
 
             delete queue;
             delete order;