Small nit on one of passwd(1)'s unveil(2)

[Ricardo Mestre]

Hi,

_PATH_MASTERPASSWD_LOCK is opened, from libutil, with O_WRONLY|O_CREAT and then
unlinked when not necessary anymore so it doesn't need read permissions.

OK?

Index: local_passwd.c
===================================================================
RCS file: /cvs/src/usr.bin/passwd/local_passwd.c,v
retrieving revision 1.59
diff -u -p -u -r1.59 local_passwd.c
--- local_passwd.c      12 Jul 2021 15:09:20 -0000      1.59
+++ local_passwd.c      30 Jul 2021 15:41:05 -0000
@@ -72,7 +72,7 @@ local_passwd(char *uname, int authentica
                return(1);
        }
 
-       if (unveil(_PATH_MASTERPASSWD_LOCK, "rwc") == -1)
+       if (unveil(_PATH_MASTERPASSWD_LOCK, "wc") == -1)
                err(1, "unveil %s", _PATH_MASTERPASSWD_LOCK);
        if (unveil(_PATH_MASTERPASSWD, "r") == -1)
                err(1, "unveil %s", _PATH_MASTERPASSWD);