Index: uspace/srv/hid/input/ctl/stty.c
===================================================================
--- uspace/srv/hid/input/ctl/stty.c	(revision c072a292c19db94ad89515ef948e5fabe05dc9f1)
+++ uspace/srv/hid/input/ctl/stty.c	(revision 132ab5d1e75253f9bae910b2748a4c13efe7e71f)
@@ -243,5 +243,8 @@
 
 	gsp_init(&sp);
-	return gsp_insert_defs(&sp, seq_defs);
+	if (gsp_insert_defs(&sp, seq_defs) < 0) {
+		return EINVAL;
+	}
+	return EOK;
 }