handle requests completions in netdb requests thread

libi2pd/NetDbRequests.cpp

@@ -172,6 +172,8 @@ namespace data
 	}
 
 	void NetDbRequests::RequestComplete (const IdentHash& ident, std::shared_ptr<RouterInfo> r)
+	{
+		GetIOService ().post ([this, ident, r]()
 			{                      
 				std::shared_ptr<RequestedDestination> request;
 				{
@@ -192,6 +194,7 @@ namespace data
 					else
 						request->Fail ();
 				}
+			});
 	}
 
 	std::shared_ptr<RequestedDestination> NetDbRequests::FindRequest (const IdentHash& ident) const