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cc1: Accept , at the end of initlist

A trailing comma is accepted at the end of a initializer.

--- a/src/cmd/cc/cc1/init.c

+++ b/src/cmd/cc/cc1/init.c

@@ -223,7 +223,7 @@

 	if (accept('{'))

 		braces = 1;

-	do {

+	for (;;) {

 		curtp = inttype;

 		switch (yytoken) {

 		case '[':

@@ -291,7 +291,11 @@

 			errorp("compound literal too big");

 		if (nelem == in.pos && !braces)

 			break;

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

+		if (!accept(','))

+			break;

+		if (yytoken == '}')

+			break;

+	}

 	if (braces)

 		expect('}');