vt: fix callback enum type

We should use the enum type instead of plain "int" to be more verbose
here.

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

src/vt.h

@@ -42,7 +42,6 @@
 #include "eloop.h"
 
 struct kmscon_vt;
-typedef bool (*kmscon_vt_cb) (struct kmscon_vt *vt, int action, void *data);
 
 enum kmscon_vt_action {
 	KMSCON_VT_ENTER,
@@ -54,6 +53,10 @@ enum kmscon_vt_id {
 	KMSCON_VT_NEW = -1,
 };
 
+typedef bool (*kmscon_vt_cb) (struct kmscon_vt *vt,
+				enum kmscon_vt_action action,
+				void *data);
+
 int kmscon_vt_new(struct kmscon_vt **out, kmscon_vt_cb cb, void *data);
 void kmscon_vt_ref(struct kmscon_vt *vt);
 void kmscon_vt_unref(struct kmscon_vt *vt);

tests/test_console.c

@@ -192,7 +192,9 @@ static void sig_term(struct ev_signal *sig, int signum, void *data)
 	terminate = 1;
 }
 
-static bool vt_switch(struct kmscon_vt *vt, int action, void *data)
+static bool vt_switch(struct kmscon_vt *vt,
+			enum kmscon_vt_action action,
+			void *data)
 {
 	struct console *con = data;
 	int ret;

tests/test_terminal.c

@@ -139,7 +139,9 @@ static void activate_outputs(struct app *app)
 	}
 }
 
-static bool vt_switch(struct kmscon_vt *vt, int action, void *data)
+static bool vt_switch(struct kmscon_vt *vt,
+			enum kmscon_vt_action action,
+			void *data)
 {
 	struct app *app = data;
 	int ret;