[PATCH] ethdev: fix ESP packet type description

[Thomas Monjalon]

>> The correct protocol number for ESP (IP Encapsulating Security Payload)
>> packet type is 50. 51 is IPSec AH (Authentication Header).
>> 
>> Fixes: 1e84afd3906b ("mbuf: add security crypto flags and fields")
>> Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>
> Reviewed-by: Morten Brørup <mb at smartsharesystems.com>

Applied, thanks