net/octeontx2: fix indirect mbuf handling during Tx

net/octeontx2: fix indirect mbuf handling during Tx

Multi segmented packet may be spliced with indirect mbufs also.
Currently driver causes buffer leak for indirect mbufs as they
were not being freed to packet pool.

Patch fixes handling of indirect mbufs for following use cases
- packet contains all indirect mbufs only.
- packet contains mixed mbufs i.e. direct and indirect both.

Fixes: cbd5710db48d ("net/octeontx2: add Tx multi segment version")

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Acked-by: Nithin Dabilpuram <ndabilpuram@marvell.com>