[libxml2] Fix unintended fall-through in xmlNodeAddContentLen

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 2464652537fa5f3b89e71c31eed777b42fa64708
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Wed May 18 02:16:34 2022 +0200

    Fix unintended fall-through in xmlNodeAddContentLen

 tree.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/tree.c b/tree.c
index 2392b994..923432f0 100644
--- a/tree.c
+++ b/tree.c
@@ -5912,10 +5912,11 @@ xmlNodeAddContentLen(xmlNodePtr cur, const xmlChar *content, int len) {
                    cur->content = xmlStrncatNew(cur->content, content, len);
                    cur->properties = NULL;
                    cur->nsDef = NULL;
-                   break;
-               }
-               cur->content = xmlStrncat(cur->content, content, len);
+               } else {
+                   cur->content = xmlStrncat(cur->content, content, len);
+                }
             }
+           break;
         case XML_DOCUMENT_NODE:
         case XML_DTD_NODE:
         case XML_HTML_DOCUMENT_NODE: