Avoid SKB coalescing if eor bit is set in one of the relevant
SKBs.

Fixes: c134ecb8 ("tcp: Make use of MSG_EOR in tcp_sendmsg")
Signed-off-by: NIlya Lesokhin <ilyal@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>