net: atlantic: Remove unnecessary conversion to bool

The '!=' expression itself is bool, no need to convert it to bool.
Fix the following coccicheck warning:

./drivers/net/ethernet/aquantia/atlantic/aq_nic.c:1477:34-39: WARNING: conversion to bool not needed here

Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Link: https://lore.kernel.org/r/1604797919-10157-1-git-send-email-kaixuxia@tencent.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>