feedback: Don't access lfb if not inited
Otherwise libfeedback asserts.
We'll relax that on the library site but let's be on the safe side here.
Related: !1267 (merged) , https://source.puri.sm/Librem5/feedbackd/-/issues/74
Signed-off-by: Guido Günther agx@sigxcpu.org
Edited by Guido Günther