libosmocore[master]: select: Find the highest fd when filling the fd_sets

[Max]

Patch Set 3: Code-Review+1

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Gerrit-MessageType: comment
Gerrit-Change-Id: I1a6d7271273ec08bb511c21b936891bc508843e4
Gerrit-PatchSet: 3
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Holger Freyther <hol...@freyther.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Max <msur...@sysmocom.de>
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