ixgbe: Remove conversion to bool in ixgbe_device_supports_autoneg_fc()

No need to convert '==' expression to bool. This fixes the following
coccicheck warning:

drivers/net/ethernet/intel/ixgbe/ixgbe_common.c:68:11-16: WARNING:
conversion to bool not needed here
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_common.c

@@ -64,8 +64,7 @@ bool ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw)
 			hw->mac.ops.check_link(hw, &speed, &link_up, false);
 			/* if link is down, assume supported */
 			if (link_up)
-				supported = speed == IXGBE_LINK_SPEED_1GB_FULL ?
-				true : false;
+				supported = speed == IXGBE_LINK_SPEED_1GB_FULL;
 			else
 				supported = true;
 		}