* Stricter handling of multi-namespace handling

* This occurs in cases where there are more than one XML namespaces in a config tree, such as `augment`:ed trees.
  * Affects all parts of the system, including datastore, backend, restconf and cli.
* Invalid api-path syntax (eg non-matching yang) error changed from 412 operation-failed to 400 Bad request invalid-value, or unknown-element.

lib/src/clixon_xml_nsctx.c

@@ -94,8 +94,8 @@ xml_nsctx_get(cvec *cvv,
  * @note NULL is a valid prefix (default)
  */
 int
-xml_nsctx_get_prefix(cvec *cvv,
-		     char *namespace,
+xml_nsctx_get_prefix(cvec  *cvv,
+		     char  *namespace,
 		     char **prefix)
 {
     cg_var *cv = NULL;