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Do not recover in semantic errors in arithmetic()

There is no need of synchronize with the input, so don't call
error().

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -583,7 +583,7 @@

 		return parithmetic(op, lp, rp);

 	default:

 	incorrect:

-		error("incorrect arithmetic operands");

+		errorp("incorrect arithmetic operands");

 	}

 	return simplify(op, lp->type, lp, rp);

@@ -709,7 +709,7 @@

 	lp = arithmetic(OADD, lp, rp);

 	tp = lp->type;

 	if (tp->op != PTR)

-		error("subscripted value is neither array nor pointer");

+		errorp("subscripted value is neither array nor pointer");

 	lp =  node(OPTR, tp->type, lp, NULL);

 	lp->lvalue = 1;

 	return lp;