Need to initialize the resource list that we keep for our children.

STAILQ's require this, while it is optional for SLIST (well, as long
as the memory is bzeroed).

Noticed by: phk's crash

sys/dev/pccard/pccard.c

@@ -256,6 +256,7 @@ pccard_attach_card(device_t dev)
 		 */
 		ivar = malloc(sizeof(struct pccard_ivar), M_DEVBUF,
 		    M_WAITOK | M_ZERO);
+		resource_list_init(&ivar->resources);
 		child = device_add_child(dev, NULL, -1);
 		device_set_ivars(child, ivar);
 		ivar->fcn = pf;