conf: switch from while to for loop for chardev parsing

This removes one level of indentation.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/conf/domain_conf.c

@@ -10926,8 +10926,10 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
     char *haveTLS = NULL;
     char *tlsFromConfig = NULL;
 
-    while (cur != NULL) {
-        if (cur->type == XML_ELEMENT_NODE) {
+    for (; cur; cur = cur->next) {
+        if (cur->type != XML_ELEMENT_NODE)
+            continue;
+
         if (virXMLNodeNameEqual(cur, "source")) {
             if (!mode)
                 mode = virXMLPropString(cur, "mode");
@@ -11019,8 +11021,6 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
                 protocol = virXMLPropString(cur, "type");
         }
     }
-        cur = cur->next;
-    }
 
     switch ((virDomainChrType) def->type) {
     case VIR_DOMAIN_CHR_TYPE_NULL: