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While processing transmit(tx) descriptors in 'tx_consume' routine the switch emulator suffers from an off-by-one error, if a descriptor was to have more than allowed(ROCKER_TX_FRAGS_MAX=16) fragments. Fix an incorrect bounds check to avoid it. Reported-by: Qinghao Tang <luodalongde@gmail.com> Cc: qemu-stable@nongnu.org Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Signed-off-by: Jason Wang <jasowang@redhat.com>