avf: fix coverity
avf: fix coverity

Change-Id: I54025eb0e4ee861b2b2fed554b006405cba38bb9
Signed-off-by: Mohammed Hawari <e345ebb5fb15a590b29a075cdaf46eed42e192de@hawari.fr>
Type: fix
Fixes: bd376a8ce8425f45b23074398949e8055de29280

FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp