dpdk: fix crypto coverity warning
dpdk: fix crypto coverity warning

Change-Id: I165b64fdc12dd2936df1958348e93b709ce0e784
Signed-off-by: Sergio Gonzalez Monroy <efb28dd1236fe58fb57f933212eddfe89b9da704@intel.com>

milanlenco/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,FDio/vpp,milanlenco/vpp,milanlenco/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,milanlenco/vpp,milanlenco/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,milanlenco/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp