drm/nouveau: use kmemdup for edid allocation/copying

Avoids potential null pointer dereference.
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_connector.c

@@ -399,8 +399,9 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 		struct edid *edid =
 			(struct edid *)nouveau_bios_embedded_edid(dev);
 		if (edid) {
-			nv_connector->edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
-			*(nv_connector->edid) = *edid;
+			nv_connector->edid =
+					kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
+			if (nv_connector->edid)
 				status = connector_status_connected;
 		}
 	}