[libxml2] Fix missing part of comment for function xmlXPathEvalExpression()

[Daniel Veillard <veillard src gnome org>]

commit dbb828feb9ba9a3b2694883b7d59787b121660a2
Author: Daniel Veillard <veillard redhat com>
Date:   Mon Aug 28 20:38:53 2017 +0200

    Fix missing part of comment for function xmlXPathEvalExpression()

 xpath.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/xpath.c b/xpath.c
index 1a0bbc9..5b58c8f 100644
--- a/xpath.c
+++ b/xpath.c
@@ -15146,7 +15146,10 @@ xmlXPathNodeEval(xmlNodePtr node, const xmlChar *str, xmlXPathContextPtr ctx) {
  * @str:  the XPath expression
  * @ctxt:  the XPath context
  *
- * Alias for xmlXPathEval.
+ * Alias for xmlXPathEval().
+ *
+ * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
+ *         the caller has to free the object.
  */
 xmlXPathObjectPtr
 xmlXPathEvalExpression(const xmlChar *str, xmlXPathContextPtr ctxt) {