openbsc[master]: chan_alloc.c: Fix log var formatting issues

[Stefan Sperling]

Patch Set 1: Code-Review+1

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Gerrit-MessageType: comment
Gerrit-Change-Id: Id2ed51eed42e9fd9c91d257c245f7bce8d568f3a
Gerrit-PatchSet: 1
Gerrit-Project: openbsc
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pes...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Stefan Sperling <ssperl...@sysmocom.de>
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