[PATCH] app/testpmd: fix VLAN header parsing

[Raslan Darawsheh]

>> Updated the `get_ethertype_by_ptype` function to correctly parse VLAN
>> headers.

>You should describe what is broken and how.
I’ll handle in v2

>> Fixes: 76730c7b9b5a ("app/testpmd: use packet type parsing API")
>> Cc: haijie1 at huawei.com

>Do you think it is critical for the release?
Yes, as it’s causing an infinite loop if you send a QinQ packet with csum fwd, and it will cause tested to get stuck forever.


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