tests/ioctl_evdev.c: check EVIOCGUNIQ decoding

* tests/ioctl_evdev.c (main): Check EVIOCGUNIQ(0) decoding.
diff --git a/tests/ioctl_evdev.c b/tests/ioctl_evdev.c
index 5e22894..977c7aa 100644
--- a/tests/ioctl_evdev.c
+++ b/tests/ioctl_evdev.c
@@ -107,6 +107,7 @@
 
 	TEST_NULL_ARG(EVIOCGNAME(0));
 	TEST_NULL_ARG(EVIOCGPHYS(0));
+	TEST_NULL_ARG(EVIOCGUNIQ(0));
 	TEST_NULL_ARG(EVIOCGKEY(0));
 	TEST_NULL_ARG(EVIOCGLED(0));
 # ifdef EVIOCGMTSLOTS