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Fix grammar of aggregate initializers

After last commits, the grammar was incorrect because
there was no loop until no accept(,').

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -363,11 +363,15 @@

 static void

 initializer(Symbol *sym)

 {

-	Type *tp = sym->type;

 	Node *np;

 	if (accept('{')) {

-		initializer(sym);

+		do {

+			if (yytoken == '}')

+				break;

+			initializer(sym);

+		} while (accept(',');

+

 		expect('}');

 		return;

 	}

@@ -376,7 +380,6 @@

 		emit(OEXPR, assignop(OINIT, varnode(sym), np));

 		return;

 	}

-	return;

 }

 static Symbol *