optionmap: remove superfluous code
This was noticed while looking at a false-positive in the report for PVS-Studio, in #192. * spot/misc/optionmap.cc: Do not remove the option from unused_ twice..
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@ -182,7 +182,6 @@ namespace spot
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int
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option_map::operator[](const char* option) const
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{
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unused_.erase(option);
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return get(option);
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}
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