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cryptenroll: use [] in --help text to indicate block device argument is now optional
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@ -171,7 +171,7 @@ static int help(void) {
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if (r < 0)
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return log_oom();
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printf("%1$s [OPTIONS...] BLOCK-DEVICE\n\n"
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printf("%1$s [OPTIONS...] [BLOCK-DEVICE]\n\n"
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"%5$sEnroll a security token or authentication credential to a LUKS volume.%6$s\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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