[hackers] [sbase] Fix small issue in nl(1) || FRIGN

[git]

commit 28c5d560fbf5303b0747471d4c5ffab0be7181db
Author: FRIGN <d...@frign.de>
Date:   Sat Apr 4 23:09:06 2015 +0200

    Fix small issue in nl(1)
    
    If fp == NULL we don't want to close it.

diff --git a/nl.c b/nl.c
index b84fe32..49c1d10 100644
--- a/nl.c
+++ b/nl.c
@@ -111,7 +111,7 @@ getlinetype(char *type, regex_t *preg)
 int
 main(int argc, char *argv[])
 {
-       FILE *fp;
+       FILE *fp = NULL;
        size_t l, s;
        char *d, *formattype, *formatblit;
 
@@ -195,6 +195,6 @@ main(int argc, char *argv[])
                nl(argv[0], fp);
        }
 
-       return !!(fshut(fp, argv[0]) + fshut(stdin, "<stdin>") +
+       return !!((fp && fshut(fp, argv[0])) + fshut(stdin, "<stdin>") +
                  fshut(stdout, "<stdout>"));
 }