libosmo-sccp[master]: vty: fix (null) string in vty config

[Harald Welte]

Patch Set 1: Code-Review+2

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Gerrit-MessageType: comment
Gerrit-Change-Id: I18f79cc4d4f1db8f2858e8e95098c5821d50594f
Gerrit-PatchSet: 1
Gerrit-Project: libosmo-sccp
Gerrit-Branch: master
Gerrit-Owner: dexter <pma...@sysmocom.de>
Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-HasComments: No