Gary Coady pointed a memory leak in xmlTextReaderReadInnerXml() applied

* xmlreader.c: Gary Coady pointed a memory leak in
  xmlTextReaderReadInnerXml() applied patch fixing #323864
Daniel
diff --git a/xmlreader.c b/xmlreader.c
index 3fd44f3..d3e35d4 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -1664,6 +1664,9 @@
         xmlBufferFree(buff2);
     }
     resbuf = buff->content;
+    buff->content = NULL;
+
+    xmlBufferFree(buff);
     return resbuf;
 }