cfg_files
char **cfg_files;
load_cfg(cfg_files[i], c, NULL, NULL, flags, NULL);
n = strlen(cfg_files[i]) + 1;
slen += xsnprintf(s + slen, n + 1, "%s,", cfg_files[i]);
expand_paths(TMUX_CONF, &cfg_files, &cfg_nfiles, 1);
free(cfg_files[i]);
cfg_files = xreallocarray(cfg_files, cfg_nfiles + 1,
sizeof *cfg_files);
cfg_files[cfg_nfiles++] = xstrdup(optarg);