don't try to save invalid router

libi2pd/NetDb.cpp

@@ -654,7 +654,7 @@ namespace data
 			std::string ident = it.second->GetIdentHashBase64();
 			if (it.second->IsUpdated ())
 			{
-				if (it.second->GetBuffer ())
+				if (it.second->GetBuffer () && !it.second->IsUnreachable ())
 				{
 					// we have something to save
 					std::shared_ptr<RouterInfo::Buffer> buffer;
@@ -663,9 +663,8 @@ namespace data
 						buffer = it.second->CopyBuffer ();
 						it.second->ScheduleBufferToDelete ();
 					}
-					if (buffer && !it.second->IsUnreachable ()) // don't save bad router
+					if (buffer)
 						saveToDisk.push_back(std::make_pair(ident, buffer));
-					it.second->SetUnreachable (false);
 				}
 				it.second->SetUpdated (false);
 				updatedCount++;

libi2pd/RouterInfo.h

@@ -293,7 +293,7 @@ namespace data
 			void DeleteBuffer () { m_Buffer = nullptr; m_IsBufferScheduledToDelete = false; };
 			std::shared_ptr<Buffer> GetSharedBuffer () const { return m_Buffer; };	
 			std::shared_ptr<Buffer> CopyBuffer () const;
-			void ScheduleBufferToDelete () { m_IsBufferScheduledToDelete = false; };
+			void ScheduleBufferToDelete () { m_IsBufferScheduledToDelete = true; };
 			bool IsBufferScheduledToDelete () const { return m_IsBufferScheduledToDelete; };
 
 			bool IsUpdated () const { return m_IsUpdated; };