Revert "tcp: Apply device TSO segment limit earlier"

Revert "tcp: Apply device TSO segment limit earlier"

This reverts commit 9f871e883277cc22c6217db806376dce52401a31, which
was commit 1485348d2424e1131ea42efc033cbd9366462b01 upstream.

It can cause connections to stall when a PMTU event occurs.  This was
fixed by commit 843925f33fcc ("tcp: Do not apply TSO segment limit to
non-TSO packets") upstream, but that depends on other changes to TSO.

The original issue this fixed was a performance regression for the sfc
driver in extreme cases of TSO (skb with > 100 segments).  This is not
really very important and it seems best to revert it rather than try
to fix it up.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: netdev@vger.kernel.org
Cc: linux-net-drivers@solarflare.com