nologin(8): write -> dprintf

[Scott Cheloha]

Use dprintf for the DEFAULT_MESG string instead of the more awkward
write+strlen combo.

ok?

--
Scott Cheloha

Index: sbin/nologin/nologin.c
===================================================================
RCS file: /cvs/src/sbin/nologin/nologin.c,v
retrieving revision 1.7
diff -u -p -r1.7 nologin.c
--- sbin/nologin/nologin.c      14 Aug 2018 18:13:11 -0000      1.7
+++ sbin/nologin/nologin.c      15 Aug 2018 14:07:28 -0000
@@ -30,7 +30,6 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <unistd.h>
 
 /* Distinctly different from _PATH_NOLOGIN. */
@@ -52,8 +51,8 @@ main(int argc, char *argv[])
                err(1, "pledge");
 
        nfd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
-       if (nfd < 0) {
-               write(STDOUT_FILENO, DEFAULT_MESG, strlen(DEFAULT_MESG));
+       if (nfd == -1) {
+               dprintf(STDOUT_FILENO, DEFAULT_MESG);
                exit (1);
        }