It is necessary to add pointer checking because in some case the
code will cause crash. For example, the code goes here before
memory allocation of rxvq is finished.
Fixes: 7365504f77 ("net/virtio: support guest announce")
Cc: stable@dpdk.org
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Reviewed-by: Jianfeng Tan <jianfeng.tan@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
7c7f2e6088