apps/lnewusers.c first sets fp=stdin but then always unconditionally overwrites fp before using with:

84 >-------/ Open the file we're going to look at. /
85 >-------if (file != NULL) {
86 >------->-------fp = fopen(file, "r");
87 >------->-------if (fp == NULL) {
88 >------->------->-------fprintf(stderr, _("Error opening `%s': %s.\n"),
89 >------->------->------->-------file, strerror(errno));
90 >------->------->-------return 2;
91 >------->-------}
92 >-------} else {
93 >------->-------fp = stdin;
94 >-------}
95

We can probably drop the else to avoid confusing static analyzers.