Provide correct warning in CheckForkWarningConditions for large worked invalid chain. (dashpay#1234)

Author: thelazier

src/main.cpp

@@ -1857,7 +1857,10 @@ void CheckForkWarningConditions()
         }
         else
         {
-            LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks longer than our best chain.\nChain state database corruption likely.\n", __func__);
+            if(pindexBestInvalid->nHeight > chainActive.Height() + 6)
+                LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks longer than our best chain.\nChain state database corruption likely.\n", __func__);
+            else
+                LogPrintf("%s: Warning: Found invalid chain which has higher work (at least ~6 blocks worth of work) than our best chain.\nChain state database corruption likely.\n", __func__);
             fLargeWorkInvalidChainFound = true;
         }
     }