Correct an error reported when a license is restored and then released

[ Merge of http://go/wvgerrit/128143 ]

Now reports LICENSE_STATE_ERROR rather than ERROR_DRM_GENERIC_PLUGIN
to make the cause of failure and suggested action more clear for app
developers. Also added an additional error log.

Bug: 190645000
Test: WV unit/integration tests
Change-Id: Ib23ca628c590316f90f497d8fdfbab24fd644d6f

libwvdrmengine/cdm/core/src/cdm_session.cpp

@@ -283,6 +283,11 @@ CdmResponseType CdmSession::RestoreOfflineSession(const CdmKeySetId& key_set_id,
       CdmResponseType sts = usage_table_header_->LoadEntry(
           crypto_session_.get(), usage_entry_, usage_entry_number_);
       crypto_metrics_->usage_table_header_load_entry_.Increment(sts);
+      if (sts == LOAD_USAGE_ENTRY_INVALID_SESSION) {
+        LOGE("License loaded in different session: key_set_id = %s",
+             IdToString(key_set_id));
+        return USAGE_ENTRY_ALREADY_LOADED;
+      }
       if (sts != NO_ERROR) {
         LOGE("Failed to load usage entry: status = %d", static_cast<int>(sts));
         return sts;