respondd: fix inet_pton() error message
inet_pton() doesn't set errno on regular parse errors, so using perror() doesn't make sense (and we avoid a confusing "Success" message).
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@ -666,7 +666,7 @@ int main(int argc, char **argv) {
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case 'g':
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if (!inet_pton(AF_INET6, optarg, &mgroup_addr)) {
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perror("Invalid multicast group. This message will probably confuse you");
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fprintf(stderr, "Invalid multicast group address.\n");
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exit(EXIT_FAILURE);
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}
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