return-statement with no value, in function returning ‘long long unsigned int’

src/qt/walletframe.cpp

@@ -188,6 +188,7 @@ unsigned long long WalletFrame::updateWeight()
     WalletView *walletView = currentWalletView();
     if (walletView)
         return walletView->updateWeight();
+	return 0;
 }
 
 void WalletFrame::usedSendingAddresses()

src/qt/walletmodel.cpp

@@ -680,15 +680,15 @@ bool WalletModel::saveReceiveRequest(const std::string &sAddress, const int64_t
 unsigned long long WalletModel::updateWeight()
 {
     if (!wallet)
-        return;
+        return 0;
 
     TRY_LOCK(cs_main, lockMain);
     if (!lockMain)
-    	return;
+    	return 0;
 
     TRY_LOCK(wallet->cs_wallet, lockWallet);
     if (!lockWallet)
-    	return;
+    	return 0;
 
     return wallet->GetStakeWeight();
 }

src/qt/walletview.cpp

@@ -286,6 +286,7 @@ unsigned long long WalletView::updateWeight()
 {
     if(walletModel)
 		return walletModel->updateWeight();
+	return 0;
 }
 
 void WalletView::usedSendingAddresses()