Fix a bug in the jsonReturnFromBlob() function that causes a positive result

for a negative value for when a JSON integer is too large and needs to be
converted into double.

FossilOrigin-Name: dca684da0c29ec78460362f972ea7747be42c13c4d1325da9d62c1ea58022e39

src/json.c

@@ -3856,6 +3856,7 @@ static void jsonReturnFromBlob(
       }else if( rc==3 && bNeg ){
         sqlite3_result_int64(pCtx, SMALLEST_INT64);
       }else{
+        if( bNeg ){ n--; sz++; }
         goto to_double;
       }
       break;