fix crash when reading a conf file #2068
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I have rtl_433 running on an RPi4 in a docker container based on debian buster-slim, and when I use a .conf file to specify options, rtl_433 crashes if I try to set up an rtl_tcp output. I dug down a bit and found that a strncmp() in parse_conf_option() blows up because optarg is NULL when reading a conf file.