vlc_entry: fix segfault

src/main.rs

@@ -160,7 +160,7 @@ VLC_EXPORT
 int vlc_entry(vlc_set_cb func_set, void *opaque)
 {{
     for(vlc_plugin_entry *entry=vlc_plugin_entries;
-        entry != 0; entry++)
+        *entry != NULL; entry++)
     {{
         int ret = (*entry)(func_set, opaque);
         if (ret != 0)