[Qt] Fix wallet-lock in CWallet::GetAccountAddresses(..)

src/wallet.cpp

@@ -2030,7 +2030,7 @@ set< set<CTxDestination> > CWallet::GetAddressGroupings()
 
 set<CTxDestination> CWallet::GetAccountAddresses(string strAccount) const
 {
-    AssertLockHeld(cs_wallet); // mapWallet
+    LOCK(cs_wallet);
     set<CTxDestination> result;
     BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, mapAddressBook)
     {