net/passt: Initialize "error" variable in net_passt_send() (CID 1612368)

This was flagged by Coverity as a memory illegal access.

Initialize the pointer to NULL at declaration.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
1 file changed