[libxml2] Fix structured validation errors

[Nick Wellnhofer <nwellnhof src gnome org>]

commit c709f3f2676c1ea2499ad942f1e780a5325152c2
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Thu Sep 7 19:52:39 2017 +0200

    Fix structured validation errors
    
    Also pass 'str2'. Fixes bug 777473.

 valid.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/valid.c b/valid.c
index 4df09e4..59a17c6 100644
--- a/valid.c
+++ b/valid.c
@@ -163,7 +163,7 @@ xmlErrValidNode(xmlValidCtxtPtr ctxt,
     __xmlRaiseError(schannel, channel, data, pctxt, node, XML_FROM_VALID, error,
                     XML_ERR_ERROR, NULL, 0,
                     (const char *) str1,
-                    (const char *) str1,
+                    (const char *) str2,
                     (const char *) str3, 0, 0, msg, str1, str2, str3);
 }
 #endif /* LIBXML_VALID_ENABLED or LIBXML_SCHEMAS_ENABLED */
@@ -247,7 +247,7 @@ xmlErrValidWarning(xmlValidCtxtPtr ctxt,
     __xmlRaiseError(schannel, channel, data, pctxt, node, XML_FROM_VALID, error,
                     XML_ERR_WARNING, NULL, 0,
                     (const char *) str1,
-                    (const char *) str1,
+                    (const char *) str2,
                     (const char *) str3, 0, 0, msg, str1, str2, str3);
 }