Regression in 10.0-BETA1, mdconfig has changed its return code.

[Hiroki Sato]

"Julian H. Stacey" <jhs at berklix.com> wrote
  in <201310230254.r9N2slD1067094 at fire.js.berklix.net>:

jh> Regresssion in 10.0-BETA1, mdconfig -l -v return code changed from 0
jh> to 255.  OK, its not specfied in manual, but has changed.
jh> A test script I was using caught it:
jh> 	http://www.berklix.com/~jhs/bin/sh/mdconfig_tst
jh> Probably in next day or 2 I'll hack the C & send-pr.

 Does the attached patch fix it?

-- Hiroki
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