Added guards in create object initialization to prevent memory leaks (#664)

src/bacnet/basic/object/lsp.c

@@ -745,5 +745,7 @@ void Life_Safety_Point_Cleanup(void)
  */
 void Life_Safety_Point_Init(void)
 {
-    Object_List = Keylist_Create();
+    if (!Object_List) {
+        Object_List = Keylist_Create();
+    }
 }