uterm: vt: silence gcc warning

We initialize the variable to "true" to silence gcc warnings that we might
get an uninitialized variable (which we really cannot get here).

Anyway, in the future, if the number of types may increase, the correct
way to deal with unknown types is returning "true" so do this by default
now.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/uterm_vt.c

@@ -93,7 +93,7 @@ static bool vt_event(struct kmscon_vt *ovt, enum kmscon_vt_action action,
 		     void *data)
 {
 	struct uterm_vt *vt = data;
-	int ret;
+	int ret = true;
 
 	switch (action) {
 	case KMSCON_VT_ENTER: