osmo-bts[master]: octphy: do not send empty frames to phy

[Harald Welte]

Patch Set 2: Code-Review+2

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Gerrit-MessageType: comment
Gerrit-Change-Id: Ib857b7dab490ad426c48d6a9e5e6fa10ef5a0838
Gerrit-PatchSet: 2
Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Owner: dexter <pma...@sysmocom.de>
Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: dexter <pma...@sysmocom.de>
Gerrit-HasComments: No