fix serialization segfault

Author: Azq2

source/myhtml/serialization.c

@@ -149,13 +149,13 @@ mystatus_t myhtml_serialization_node_callback(myhtml_tree_node_t* node, mycore_c
 
                     attr = attr->next;
 
-                    if (attr) {
+                    if(attr) {
                         myhtml_tree_attr_t *system_id = NULL, *public_id = NULL;
 
-                        if (attr->value.length == 6) {
-                            if (mycore_strcasecmp(attr->value.data, "SYSTEM") == 0) {
+                        if(attr->value.length == 6) {
+                            if(mycore_strcasecmp(attr->value.data, "SYSTEM") == 0) {
                                 system_id = attr->next;
-                            } else if (mycore_strcasecmp(attr->value.data, "PUBLIC") == 0) {
+                            } else if(mycore_strcasecmp(attr->value.data, "PUBLIC") == 0) {
                                 public_id = attr->next;
                                 system_id = public_id ? public_id->next : NULL;
                             }