Hide stty(1) errors.

If rc(8) is executed without using a TTY, this error appears at the
beginning:

	stty: stdin isn't a terminal

Because this is to be expected and of course not harmful, it is better
to simply hide the error message.

MFC after:	1 week

etc/rc

@@ -38,7 +38,7 @@
 # first before contemplating any changes here.  If you do need to change
 # this file for some reason, we would like to know about it.
 
-stty status '^T'
+stty status '^T' 2> /dev/null
 
 # Set shell to ignore SIGINT (2), but not children;
 # shell catches SIGQUIT (3) and returns to single user.

etc/rc.shutdown

@@ -32,7 +32,7 @@
 # Output and errors are directed to console by init, and the
 # console is the controlling terminal.
 
-stty status '^T'
+stty status '^T' 2> /dev/null
 
 # Set shell to ignore SIGINT (2), but not children;
 # shell catches SIGQUIT (3) and returns to single user after fsck.