net: hns: fix 'cdev' kernel-doc warning in hnae_ae_unregister()

Rename cdev to hdev.

Fixes the following W=1 kernel build warning(s):

drivers/net/ethernet/hisilicon/hns/hnae.c:444: warning: Excess function parameter 'cdev' description in 'hnae_ae_unregister'
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NWang Hai <wanghai38@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hnae.c

@@ -438,7 +438,7 @@ EXPORT_SYMBOL(hnae_ae_register);
 
 /**
  * hnae_ae_unregister - unregisters a HNAE AE engine
- * @cdev: the device to unregister
+ * @hdev: the device to unregister
  */
 void hnae_ae_unregister(struct hnae_ae_dev *hdev)
 {