sfc: Remove dead write to tso_state::packet_space

tso_state::packet_space is always set in tso_start_packet(); the
value set in tso_start() is not used, and is also incorrect.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 18860f2..cfa5f6d 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -926,7 +926,6 @@
 	EFX_BUG_ON_PARANOID(tcp_hdr(skb)->syn);
 	EFX_BUG_ON_PARANOID(tcp_hdr(skb)->rst);
 
-	st->packet_space = st->full_packet_size;
 	st->out_len = skb->len - st->header_len;
 	st->unmap_len = 0;
 	st->unmap_single = false;