usb-gadget/ether: use per-attribute show and store methods

To simplify the configfs interface and remove boilerplate code that also
causes binary bloat.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c
index 7b7424f..0106de8 100644
--- a/drivers/usb/gadget/function/f_ecm.c
+++ b/drivers/usb/gadget/function/f_ecm.c
@@ -855,10 +855,10 @@
 USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ecm);
 
 static struct configfs_attribute *ecm_attrs[] = {
-	&f_ecm_opts_dev_addr.attr,
-	&f_ecm_opts_host_addr.attr,
-	&f_ecm_opts_qmult.attr,
-	&f_ecm_opts_ifname.attr,
+	&ecm_opts_attr_dev_addr,
+	&ecm_opts_attr_host_addr,
+	&ecm_opts_attr_qmult,
+	&ecm_opts_attr_ifname,
 	NULL,
 };