i40e: Remove unneeded conversion to bool

The '==' expression itself is bool, no need to convert it to bool again.
This fixes the following coccicheck warning:

drivers/net/ethernet/intel/i40e/i40e_main.c:1614:52-57: WARNING:
conversion to bool not needed here
drivers/net/ethernet/intel/i40e/i40e_main.c:11439:52-57: WARNING:
conversion to bool not needed here

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>