Minor tweak.

src/patricia.c

@@ -223,13 +223,13 @@ PT_Lookup(const struct pt_y * const restrict root,
 	  char * const restrict * const restrict strings,
 	  const char * const restrict subject)
 {
-	const struct pt_y *y;
+	const struct pt_y *y = root;
 	const unsigned char *c = (unsigned char *) subject;
 
 	AN(strings);
 	AN(subject);
 
-	for (y = root; y != NULL;) {
+	while (y != NULL) {
 		const unsigned char *s;
 		unsigned char b;
 		unsigned short i;