Ignore error return from newaliases(1)

This was originally added as "exit $SUCCESS" but with nothing to set the
SUCCESS variable. Thus it became an exit with no argument, which just
exits with the status of the preceding command.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

usr.sbin/bsdinstall/scripts/config

@@ -53,7 +53,7 @@ cp $BSDINSTALL_TMPBOOT/* $BSDINSTALL_CHROOT/boot
 # Set up other things from installed config
 chroot $BSDINSTALL_CHROOT /usr/bin/newaliases > /dev/null 2>&1
 
-exit $SUCCESS
+exit 0
 
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 # END