[3.9] bpo-42214: Fix check for NOTEQUAL token in the PEG parser for the barry_as_flufl rule (GH-23048) (GH-23051)

(cherry picked from commit 06f8c3328dcd81c84d1ee2b3a57b5381dcb38482)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
diff --git a/Parser/pegen/pegen.c b/Parser/pegen/pegen.c
index 78891af..4e742a5 100644
--- a/Parser/pegen/pegen.c
+++ b/Parser/pegen/pegen.c
@@ -62,8 +62,7 @@
 /* Checks if the NOTEQUAL token is valid given the current parser flags
 0 indicates success and nonzero indicates failure (an exception may be set) */
 int
-_PyPegen_check_barry_as_flufl(Parser *p) {
-    Token *t = p->tokens[p->fill - 1];
+_PyPegen_check_barry_as_flufl(Parser *p, Token* t) {
     assert(t->bytes != NULL);
     assert(t->type == NOTEQUAL);