control/video.c: Use libvlc_media_instance_has_vout instead of libvlc_input_has_vout.

src/control/video.c

@@ -185,7 +185,7 @@ int libvlc_video_get_width( libvlc_media_instance_t *p_mi,
     return p_vout1->i_window_width;
 }
 
-vlc_bool_t libvlc_input_has_vout( libvlc_media_instance_t *p_mi,
+vlc_bool_t libvlc_media_instance_has_vout( libvlc_media_instance_t *p_mi,
                                   libvlc_exception_t *p_e )
 {
     input_thread_t *p_input_thread = libvlc_get_input_thread(p_mi, p_e);