greybus: drop a redundant assignment

Get rid of a duplicate assignment of an interface's device id.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
diff --git a/drivers/staging/greybus/module.c b/drivers/staging/greybus/module.c
index 4c6e084..3a64a2b 100644
--- a/drivers/staging/greybus/module.c
+++ b/drivers/staging/greybus/module.c
@@ -168,7 +168,6 @@
 		/* XXX clear route */
 		return ret;
 	}
-	interface->device_id = device_id;
 
 	return 0;
 }