Revert "hw/net/net_tx_pkt: Fix overrun in update_sctp_checksum()"

This reverts commit 83ddb3d.

The added check is no longer necessary due to a change of
iov_from_buf().

Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Akihiko Odaki <[email protected]>
Signed-off-by: Jason Wang <[email protected]>

Author: akihikodaki

hw/net/net_tx_pkt.c

@@ -141,10 +141,6 @@ bool net_tx_pkt_update_sctp_checksum(struct NetTxPkt *pkt)
     uint32_t csum = 0;
     struct iovec *pl_start_frag = pkt->vec + NET_TX_PKT_PL_START_FRAG;
 
-    if (iov_size(pl_start_frag, pkt->payload_frags) < 8 + sizeof(csum)) {
-        return false;
-    }
-
     if (iov_from_buf(pl_start_frag, pkt->payload_frags, 8, &csum, sizeof(csum)) < sizeof(csum)) {
         return false;
     }