avf: fix coverity issue
avf: fix coverity issue

Change-Id: I1b589c924326a98c4cabe5496ce72b20673b5153
Signed-off-by: Mohammed Hawari <e345ebb5fb15a590b29a075cdaf46eed42e192de@hawari.fr>
Type: fix

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