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avconv: remove bogus warning when using avconv -h without parameter
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@ -1792,7 +1792,7 @@ void show_help_default(const char *opt, const char *arg)
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const int per_file = OPT_SPEC | OPT_OFFSET | OPT_PERFILE;
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int show_advanced = 0, show_avoptions = 0;
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if (opt) {
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if (opt && *opt) {
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if (!strcmp(opt, "long"))
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show_advanced = 1;
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else if (!strcmp(opt, "full"))
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