TCP: tcp_hybla: Fix integer overflow in slow start increment

For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16.

Signed-off-by: Daniele Lacamera <root@danielinux.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/tcp_hybla.c
Simple merge