Fix wl_method for screenshooter.
diff --git a/egl-compositor.c b/egl-compositor.c
index 8b3105b..c4c4f11 100644
--- a/egl-compositor.c
+++ b/egl-compositor.c
@@ -212,7 +212,7 @@
 }
 
 static const struct wl_method screenshooter_methods[] = {
-	{ "shoot", screenshooter_shoot, 0, NULL }
+	{ "shoot", screenshooter_shoot, "", NULL }
 };
 
 static const struct wl_interface screenshooter_interface = {