doc: fix code example which may provoke warning
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| @@ -682,7 +682,7 @@ Then have long options defined: | |
| static const struct option <applet>_long_options[] = { | |
| { "list", 0, NULL, 't' }, | |
| { "extract", 0, NULL, 'x' }, | |
| - | { NULL } |
| + | { NULL, 0, NULL, 0 } |
| }; | |
| And a code block similar to the following near the top of your applet_main() | |