osmo-bsc[master]: cosmetic: tighten function type signatures

[Harald Welte]

Patch Set 1: Code-Review+2

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Gerrit-MessageType: comment
Gerrit-Change-Id: I6a572fc78371c69f5308edbad0ebe15e143d0505
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Owner: Max <msur...@sysmocom.de>
Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofm...@sysmocom.de>
Gerrit-HasComments: No