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[cc2] Fix array overflow checks in parser.c

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -154,7 +154,7 @@

 static Node *

 push(void *elem)

 {

-	if (sp == stack[STACKSIZ])

+	if (sp == &stack[STACKSIZ])

 		error(ESTACKO);

 	return *sp++ = elem;

 }

@@ -387,7 +387,7 @@

 	struct swtch *cur;

 	Node *np = newnode(u.op);

-	if (swp == &swtbl[NR_BLOCK+1])

+	if (swp == &swtbl[NR_BLOCK])

 		error(EWTACKO);

 	cur = swp++;

 	cur->nr = 0;