Index: uspace/srv/hid/input/ctl/stty.c
===================================================================
--- uspace/srv/hid/input/ctl/stty.c	(revision d5c1051faf4391647834d99babdd4a44ee5d9700)
+++ uspace/srv/hid/input/ctl/stty.c	(revision 48fd597f94954b7c9bbec15bf09144fafd7adcb3)
@@ -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;
 }