qlcnic: fix error return code in qlcnic_83xx_restart_hw()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 3ced0a88 ("qlcnic: Add support to run firmware POST")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1605248186-16013-1-git-send-email-zhangchangzhong@huawei.com


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