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[cc1] Fix bug after 0fc57e5

0fc57e5 fixed a bug but introduced another one.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -304,7 +304,8 @@

 	if (accept(')'))

 		return 0;

-	for (n = 0; ; ++n) {

+	n = 0;

+	do {

 		if (n == NR_MACROARG) {

 			cpperror("too much parameters in macro");

 			return NR_MACROARG;

@@ -315,11 +316,9 @@

 		}

 		sym = install(NS_IDEN, yylval.sym);

 		sym->flags |= SUSED;

-		args[n] = sym;

+		args[n++] = sym;

 		next();

-		if (!accept(','))

-			break;

-	}

+	} while (accept(','));

 	expect(')');

 	return n;