qlcnic: Optimize ring count validations

- Check interrupt mode at the start of qlcnic_set_channels().
- Do not validate ring count if they are not going to change.

Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
Simple merge

diff --cc drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
Simple merge