build: add option for sanitizers

src/gridcoin/scraper/scraper_net.cpp

@@ -139,9 +139,7 @@ int CSplitBlob::addPartData(CDataStream&& vData)
     {
         /* missing data; use the supplied data */
         /* prevent calling the Complete callback FIXME: make this look better */
-        cntPartsRcvd--;
         CSplitBlob::RecvPart(nullptr, vData);
-        cntPartsRcvd++;
     }
     return n;
 }