refactor: inline constant return value of CDBWrapper::Erase and BlockTreeDB::WriteReindexing

Did both in this commit, since the return value of `WriteReindexing` was ignored anyway - which existed only because of the constant `Erase` being called

src/dbwrapper.h

@@ -255,12 +255,11 @@ public:
     }
 
     template <typename K>
-    bool Erase(const K& key, bool fSync = false)
+    void Erase(const K& key, bool fSync = false)
     {
         CDBBatch batch(*this);
         batch.Erase(key);
         WriteBatch(batch, fSync);
-        return true;
     }
 
     void WriteBatch(CDBBatch& batch, bool fSync = false);

src/node/blockstorage.cpp

@@ -59,13 +59,12 @@ bool BlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo& info)
     return Read(std::make_pair(DB_BLOCK_FILES, nFile), info);
 }
 
-bool BlockTreeDB::WriteReindexing(bool fReindexing)
+void BlockTreeDB::WriteReindexing(bool fReindexing)
 {
     if (fReindexing) {
         Write(DB_REINDEX_FLAG, uint8_t{'1'});
-        return true;
     } else {
-        return Erase(DB_REINDEX_FLAG);
+        Erase(DB_REINDEX_FLAG);
     }
 }
 

src/node/blockstorage.h

@@ -55,7 +55,7 @@ public:
     bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*>>& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
     bool ReadBlockFileInfo(int nFile, CBlockFileInfo& info);
     bool ReadLastBlockFile(int& nFile);
-    bool WriteReindexing(bool fReindexing);
+    void WriteReindexing(bool fReindexing);
     void ReadReindexing(bool& fReindexing);
     bool WriteFlag(const std::string& name, bool fValue);
     bool ReadFlag(const std::string& name, bool& fValue);