fix IDE/compiler warning "extra ';'" in validationinterface.h

src/validationinterface.h

@@ -28,13 +28,13 @@ void SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL);
 
 class CValidationInterface {
 protected:
-    virtual void SyncTransaction(const CTransaction &tx, const CBlock *pblock) {};
-    virtual void EraseFromWallet(const uint256 &hash) {};
-    virtual void SetBestChain(const CBlockLocator &locator) {};
-    virtual void UpdatedTransaction(const uint256 &hash) {};
-    virtual void Inventory(const uint256 &hash) {};
-    virtual void ResendWalletTransactions(int64_t nBestBlockTime) {};
-    virtual void BlockChecked(const CBlock&, const CValidationState&) {};
+    virtual void SyncTransaction(const CTransaction &tx, const CBlock *pblock) {}
+    virtual void EraseFromWallet(const uint256 &hash) {}
+    virtual void SetBestChain(const CBlockLocator &locator) {}
+    virtual void UpdatedTransaction(const uint256 &hash) {}
+    virtual void Inventory(const uint256 &hash) {}
+    virtual void ResendWalletTransactions(int64_t nBestBlockTime) {}
+    virtual void BlockChecked(const CBlock&, const CValidationState&) {}
     friend void ::RegisterValidationInterface(CValidationInterface*);
     friend void ::UnregisterValidationInterface(CValidationInterface*);
     friend void ::UnregisterAllValidationInterfaces();