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Convert empry inirializers to the correct type

zero has integer type, and it is not what we always want.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -328,9 +328,10 @@

 	case PTR:

 	case INT:

 	case ENUM:

-		aux = (sym) ? *sym->u.init : constnode(zero);

+		aux = (sym) ? *sym->u.init : convert(constnode(zero), tp, 0);

 		emitexp(OEXPR, aux);

 		break;

+	/* TODO: case UNION: */

 	case STRUCT:

 	case ARY:

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

@@ -339,10 +340,13 @@

 		}

 		break;

 	default:

-		/* TODO: Handle other kind of constants */

 		abort();

 	}

+	if (sym) {

+		free(sym->u.init);

+		sym->u.init = NULL;

+	}

 	freetree(np);

 	return;