net: hns3: remove redundant null check of an array

The null check of filp->f_path.dentry->d_iname is redundant because
it is an array of DNAME_INLINE_LEN chars and cannot be a null. Fix
this by removing the null check.

Addresses-Coverity: ("Array compared against 0")
Fixes: 04987ca1 ("net: hns3: add debugfs support for tm nodes, priority and qset info")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Link: https://lore.kernel.org/r/20210203131040.21656-1-colin.king@canonical.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c

@@ -494,9 +494,6 @@ static ssize_t hns3_dbg_read(struct file *filp, char __user *buffer,
 	ssize_t size = 0;
 	int ret = 0;
 
-	if (!filp->f_path.dentry->d_iname)
-		return -EINVAL;
-
 	read_buf = kzalloc(HNS3_DBG_READ_LEN, GFP_KERNEL);
 	if (!read_buf)
 		return -ENOMEM;