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Convert errors in Case() in semantic errors

Again, it is not needed to recover in this case.

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -238,17 +238,20 @@

 	expect(CASE);

 	if (!lswitch)

-		error("case label not within a switch statement");

+		errorp("case label not within a switch statement");

 	if ((np = iconstexpr()) == NULL)

-		error("case label does not reduce to an integer constant");

+		errorp("case label does not reduce to an integer constant");

 	expect(':');

-	pcase = xmalloc(sizeof(*pcase));

-	pcase->expr = np;

-	pcase->next = lswitch->head;

-	emit(OLABEL, pcase->label = newlabel());

-	lswitch->head = pcase;

-	if (++lswitch->nr == NR_SWITCH)

-		error("too case labels for a switch statement");

+	if (lswitch) {

+		pcase = xmalloc(sizeof(*pcase));

+		pcase->expr = np;

+		pcase->next = lswitch->head;

+		emit(OLABEL, pcase->label = newlabel());

+		lswitch->head = pcase;

+		if (++lswitch->nr == NR_SWITCH)

+			errorp("too case labels for a switch statement");

+		/* TODO: Avoid repetion of this error for the same switch */

+	}

 	stmt(lbreak, lcont, lswitch);

 }