Fix same -V version string

Restconf exit segv

lib/clixon/clixon_plugin.h

@@ -340,7 +340,7 @@ typedef int (errmsg_t)(clixon_handle h, const char *fn, const int line,
  *
  * A plugin can customize a version (or banner) output on stdout.
  * Several version strings can be printed if there are multiple callbacks.
- * If not regstered plugins exist, clixon prints CLIXON_VERSION_STRING
+ * If not registered plugins exist, clixon prints CLIXON_VERSION_STRING
  * Typically invoked by command-line option -V
  * @param[in]  h   Clixon handle
  * @param[in]  f   Output file

lib/src/clixon_xml.c

@@ -1588,7 +1588,6 @@ xml_rm_children(cxobj          *xp,
     return retval;
 }
 
-
 /*! Remove top XML object and all children except a single child
  *
  * Given a root xml node, and the i:th child, remove the child from its parent

lib/src/clixon_xml_map.c

@@ -408,6 +408,8 @@ xml_diff1(cxobj     *x0,
     for (;;){
         if (x0c == NULL && x1c == NULL)
             goto ok;
+        y0c = NULL;
+        y1c = NULL;
         /* If cl:ignore-compare extension, return equal */
         if (x0c && (y0c = xml_spec(x0c)) != NULL){
             if (yang_extension_value(y0c, "ignore-compare", CLIXON_LIB_NS, &extflag, NULL) < 0)