IB/hfi1: Remove open coded reference to skb frag offset

frag offset should be obtained from skb_frag_off; update the code.
Signed-off-by: David Ahern <dsahern@kernel.org>
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Link: https://lore.kernel.org/r/20230911215753.12325-1-dsahern@kernel.orgSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/hfi1/ipoib_tx.c

@@ -217,7 +217,7 @@ static int hfi1_ipoib_build_ulp_payload(struct ipoib_txreq *tx,
 		ret = sdma_txadd_page(dd,
 				      txreq,
 				      skb_frag_page(frag),
-				      frag->bv_offset,
+				      skb_frag_off(frag),
 				      skb_frag_size(frag),
 				      NULL, NULL, NULL);
 		if (unlikely(ret))