Some utmp feature fixes for WATCH

[Janos Farkas <chexum@shadow.banki.hu>]

[Part 2 of 2 from my just-found forgotten bug list :)]

With the WATCH feature, and without this patch, I used to get messages
like:

root has logged off 2 from .
 has logged on 2 from .
 has logged off p1 from somehost.
someuser has logged on p1 from somehost.

This clearly depends on the utmp-managing programs, but
I think it's correct to ignore the entries which do not
contain a name.

Janos

diff -urN zsh-2.6-beta21.orig/Src/watch.c zsh-2.6-beta21/Src/watch.c
--- zsh-2.6-beta21.orig/Src/watch.c	Mon May  6 16:08:59 1996
+++ zsh-2.6-beta21/Src/watch.c	Sun Jun 23 22:56:56 1996
@@ -274,6 +274,9 @@
     char *v, *vv, sav;
     int bad;
 
+    if (*u->ut_name == 0)
+	return;
+
     if (*w && !strcmp(*w, "all")) {
 	(void)watchlog2(inout, u, fmt, 1, 0);
 	return;