ip link: Fix crash on older kernels when show VF dev

The issue was caused that ifla_vf_rate does not exist on
older kernels and should be checked if it exists as nested attr.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Reported-by: William Dauchy <william@gandi.net>
Tested-by: William Dauchy <william@gandi.net>
1 file changed