Close CDM sessions only if opened

[ Merge of http://go/wvgerrit/49822 ]

This avoids logging an unnecessary error, when the session is not found.

Bug: 79210873
Test: Wv unit/integration test, GtsMediaDrmTest, playback with Play
      Movies and Netflix.

Change-Id: Ifef99d1380d763670ad0fa89c885fb5fd41567e2

libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp

@@ -142,6 +142,7 @@ WVDrmPlugin::~WVDrmPlugin() {
     }
   }
   mCryptoSessions.clear();
+  if (mCdmIdentifierBuilder.is_sealed()) {
     CdmIdentifier identifier;
     Status status = mCdmIdentifierBuilder.getCdmIdentifier(&identifier);
     if (status != Status::OK) {
@@ -153,6 +154,7 @@ WVDrmPlugin::~WVDrmPlugin() {
       }
     }
   }
+}
 
 Status WVDrmPlugin::openSessionCommon(std::vector<uint8_t>& sessionId) {
   Status status = Status::OK;