[PATCH] ethdev: fix get_reg_info

[Stephen Hemminger]

On Tue, 18 Feb 2025 12:58:28 +0100
Thierry Herbelot <thierry.herbelot at 6wind.com> wrote:

> 'width' and 'offset' are input parameters when dumping the register
> info of an Ethernet device. They should be copied in the new request
> before calling the device callback function.
> 
> Fixes: 083db2ed9e9 ('ethdev: add report of register names and filter')
> Cc: stable at dpdk.org
> 
> Signed-off-by: Thierry Herbelot <thierry.herbelot at 6wind.com>

Why does the ethdev code create an on stack temporary variable.
Looks like it only wants to make sure that names element is NULL.

Really should be one function and when extended fields were added
should have used API versioning.
Probably too late now, although rte_eth_dev_get_reg_info_ext()
is an experimental API.