removed compilation warnings from scanner

src/blockchain_utilities/blockchain_scanner.cpp

@@ -214,11 +214,9 @@ plot 'stats.csv' index "DATA" using (timecolumn(1,"%Y-%m-%d")):4 with lines, ''
 #define MAX_RINGS	0xffffffff
 
   struct tm prevtm = {0}, currtm;
-  uint64_t prevsz = 0, currsz = 0;
-  uint64_t prevtxs = 0, currtxs = 0;
+  uint64_t currsz = 0;
+  uint64_t currtxs = 0;
   uint64_t currblks = 0;
-  uint32_t txhr[24] = {0};
-  unsigned int i;
 
   const std::map<uint8_t, std::pair<uint64_t, std::pair<std::string, std::string>>> audit_hard_forks = get_config(net_type).AUDIT_HARD_FORKS;
   
@@ -247,8 +245,6 @@ plot 'stats.csv' index "DATA" using (timecolumn(1,"%Y-%m-%d")):4 with lines, ''
     }
 skip:
     currsz += bd.size();
-    uint64_t coinbase_amount;
-    uint64_t tx_fee_amount = 0;
     std::set<std::string> used_assets, miner_tx_assets, protocol_tx_assets;
     std::map<size_t, std::vector<std::string>> used_tx_versions;
     used_assets.insert("SAL");