libvlc vlm init fix Don't test p_vlm twice if it wasn't NULL the first time...

libvlc vlm init fix Don't test p_vlm twice if it wasn't NULL the first time Don't add the callback if the creation failed
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

src/control/vlm.c

@@ -159,15 +159,16 @@ static int libvlc_vlm_init( libvlc_instance_t *p_instance,
     if( !p_instance->p_vlm )
     {
         p_instance->p_vlm = vlm_New( p_instance->p_libvlc_int );
-        var_AddCallback( (vlc_object_t *)p_instance->p_vlm, "intf-event", VlmEvent,
-                         p_instance->p_event_manager );
-    }
         if( !p_instance->p_vlm )
         {
             libvlc_exception_raise( p_exception,
                                     "Unable to create VLM." );
             return VLC_EGENERIC;
         }
+        var_AddCallback( (vlc_object_t *)p_instance->p_vlm, "intf-event", VlmEvent,
+                         p_instance->p_event_manager );
+    }
+
     return VLC_SUCCESS;
 }
 #define VLM_RET(p,ret) do {                                     \