Fix a bug with the dahdi_setoption callback in chan_dahdi.

This function incorrectly reported success even if the option was
unsupported. This was exposed by the options to change the underlying
channel format. The function now returns a failure if the option
is unsupported.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@188705 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -5035,6 +5035,8 @@ static int dahdi_setoption(struct ast_channel *chan, int option, void *data, int
 			dahdi_disable_ec(p);
 		}
 		break;
+	default:
+		return -1;
 	}
 	errno = 0;