i40e driver was removing elements when iterating tailq lists
with TAILQ_FOREACH macro, which is not safe.
It is especially visible since the memory is zeroed on free
(commit ea0bddbd14e6).
Instead, TAILQ_FOREACH_SAFE macro is used when removing/freeing
these elements.
Fixes: 4861cde46116 ("i40e: new poll mode driver")
Fixes: 440499cf5376 ("net/i40e: support floating VEB")
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
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