Fix compilation issue on Travis since GCC uses C90 by default there.

mwparserfromhell/parser/ctokenizer/tok_support.c

@@ -196,6 +196,23 @@ int Tokenizer_check_route(Tokenizer* self, uint64_t context)
 }
 
 /*
+    Free the tokenizer's bad route cache tree. Intended to be called by the
+    main tokenizer function after parsing is finished.
+*/
+void Tokenizer_free_bad_route_tree(Tokenizer *self)
+{
+    struct avl_tree_node *cur = avl_tree_first_in_postorder(self->bad_routes);
+    struct avl_tree_node *parent;
+    while (cur) {
+        route_tree_node *node = avl_tree_entry(cur, route_tree_node, node);
+        parent = avl_get_parent(cur);
+        free(node);
+        cur = avl_tree_next_in_postorder(cur, parent);
+    }
+    self->bad_routes = NULL;
+}
+
+/*
     Write a token to the current token stack.
 */
 int Tokenizer_emit_token(Tokenizer* self, PyObject* token, int first)

mwparserfromhell/parser/ctokenizer/tok_support.h

@@ -33,6 +33,7 @@ PyObject* Tokenizer_pop(Tokenizer*);
 PyObject* Tokenizer_pop_keeping_context(Tokenizer*);
 void* Tokenizer_fail_route(Tokenizer*);
 int Tokenizer_check_route(Tokenizer*, uint64_t);
+void Tokenizer_free_bad_route_tree(Tokenizer*);
 
 int Tokenizer_emit_token(Tokenizer*, PyObject*, int);
 int Tokenizer_emit_token_kwargs(Tokenizer*, PyObject*, PyObject*, int);

mwparserfromhell/parser/ctokenizer/tokenizer.c

@@ -22,6 +22,7 @@ SOFTWARE.
 
 #include "tokenizer.h"
 #include "tok_parse.h"
+#include "tok_support.h"
 #include "tokens.h"
 
 /* Globals */
@@ -165,10 +166,7 @@ static PyObject* Tokenizer_tokenize(Tokenizer* self, PyObject* args)
 
     tokens = Tokenizer_parse(self, context, 1);
 
-    route_tree_node *n;
-    avl_tree_for_each_in_postorder(n, self->bad_routes, route_tree_node, node)
-        free(n);
-    self->bad_routes = NULL;
+    Tokenizer_free_bad_route_tree(self);
 
     if (!tokens || self->topstack) {
         Py_XDECREF(tokens);