mail.local: don't send an extra NUL byte to comsat

[Todd C. Miller]

There's no need to send a NUL byte to comsat, it NUL-terminates the
buffer itself.

 - todd

Index: libexec/mail.local/mail.local.c
===================================================================
RCS file: /cvs/src/libexec/mail.local/mail.local.c,v
retrieving revision 1.34
diff -u -p -u -r1.34 mail.local.c
--- libexec/mail.local/mail.local.c     6 Jul 2015 15:02:51 -0000       1.34
+++ libexec/mail.local/mail.local.c     6 Jul 2015 15:03:55 -0000
@@ -324,7 +324,7 @@ notifybiff(char *msg)
                return;
        }
 
-       len = strlen(msg) + 1;  /* XXX */
+       len = strlen(msg);
        if (sendto(f, msg, len, 0, res->ai_addr, res->ai_addrlen) != len)
                merr(NOTFATAL, "sendto biff: %s", strerror(errno));
 }