Pull #3003: fix unused stream in DefaultPluginXmlFactory#write

Author: Vincent Potucek

impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultPluginXmlFactory.java

@@ -81,6 +81,7 @@ public void write(XmlWriterRequest<PluginDescriptor> request) throws XmlWriterEx
         nonNull(request, "request");
         PluginDescriptor content = nonNull(request.getContent(), "content");
         Path path = request.getPath();
+        Path pathUnused;
         OutputStream outputStream = request.getOutputStream();
         Writer writer = request.getWriter();
         if (writer == null && outputStream == null && path == null) {
@@ -93,7 +94,7 @@ public void write(XmlWriterRequest<PluginDescriptor> request) throws XmlWriterEx
                 new PluginDescriptorStaxWriter().write(outputStream, content);
             } else {
                 try (OutputStream os = Files.newOutputStream(path)) {
-                    new PluginDescriptorStaxWriter().write(outputStream, content);
+                    new PluginDescriptorStaxWriter().write(os, content);
                 }
             }
         } catch (Exception e) {