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fix segfault if user only specifies 1 file
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@ -142,7 +142,7 @@ int comm_main (int argc, char **argv)
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opt = bb_getopt_ulflags(argc, argv, "123");
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if ((opt & 0x80000000UL) || (optind == argc))
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if (optind != argc + 2)
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bb_show_usage();
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if (opt & COMM_OPT_1)
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