Fix missing safePosition in SkipEndElement

Author: BigBang1112

MinimalXmlReader/MiniXmlReader.cs

@@ -197,8 +197,11 @@ public bool SkipEndElement()
     {
         _ = SkipSpaces();
 
+        var safePosition = position;
+
         if (!SkipChar('<') || !SkipChar('/'))
         {
+            position = safePosition;
             return false;
         }