minor variable init changes in init.cpp

- explicit init of pcoinsdbview and pwalletMain (even if not needed, as
  globals are init to NULL, it seems cleaner)
- remove check if (pwalletMain) in Shutdown() as delete is valid even if
  pwalletMain is NULL

src/init.cpp

@@ -45,7 +45,7 @@ using namespace boost;
 using namespace std;
 
 #ifdef ENABLE_WALLET
-CWallet* pwalletMain;
+CWallet* pwalletMain = NULL;
 #endif
 
 #ifdef WIN32
@@ -109,7 +109,7 @@ bool ShutdownRequested()
     return fRequestShutdown;
 }
 
-static CCoinsViewDB *pcoinsdbview;
+static CCoinsViewDB *pcoinsdbview = NULL;
 
 void Shutdown()
 {
@@ -165,8 +165,8 @@ void Shutdown()
 #endif
     UnregisterAllWallets();
 #ifdef ENABLE_WALLET
-    if (pwalletMain)
     delete pwalletMain;
+    pwalletMain = NULL;
 #endif
     LogPrintf("%s: done\n", __func__);
 }
@@ -701,6 +701,7 @@ bool AppInit2(boost::thread_group& threadGroup)
     fIsBareMultisigStd = GetArg("-permitbaremultisig", true) != 0;
 
     // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log
+
     // Sanity check
     if (!InitSanityCheck())
         return InitError(_("Initialization sanity check failed. Bitcoin Core is shutting down."));