Dont run full check every time we decrypt wallet.

src/crypter.h

@@ -121,6 +121,9 @@ private:
     // if fUseCrypto is false, vMasterKey must be empty
     bool fUseCrypto;
 
+    // keeps track of whether Unlock has run a thourough check before
+    bool fDecryptionThoroughlyChecked;
+
 protected:
     bool SetCrypted();
 
@@ -130,7 +133,7 @@ protected:
     bool Unlock(const CKeyingMaterial& vMasterKeyIn);
 
 public:
-    CCryptoKeyStore() : fUseCrypto(false)
+    CCryptoKeyStore() : fUseCrypto(false), fDecryptionThoroughlyChecked(false)
     {
     }