fix(fhi72): Fix use-after-free bug in fhi_72 lib

Bartosz Podrygajlorequested to merge
use-after-free-fix into develop

Signed-off-by: Bartosz Podrygajlo bartosz.podrygajlo@openairinterface.org

I put build-only since its a very simple change. It can be tested together with the next integration branch.

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