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Select the correct type in emitdesig()

The child type in arrays is the subtype, but in struct/unions is
the type in the array of fields of the type.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -313,6 +313,7 @@

 	Symbol *sym;

 	size_t n;

 	Node *aux;

+	Type *p;

 	if (!np) {

 		sym = NULL;

@@ -336,7 +337,8 @@

 	case ARY:

 		for (n = 0; n < tp->n.elem; ++n) {

 			aux = (sym) ? sym->u.init[n] : NULL;

-			emitdesig(aux, tp->type);

+			p = (tp->op == ARY) ? tp->type : tp->p.fields[n]->type;

+			emitdesig(aux, p);

 		}

 		break;

 	default: