net: ethtool: fix the error condition in ethtool_get_phy_stats_ethtool()

[Hariprasad Kelam]

> Clang static checker (scan-build) warning:
> net/ethtool/ioctl.c:line 2233, column 2
> Called function pointer is null (null dereference).
> 
> Return '-EOPNOTSUPP' when 'ops->get_ethtool_phy_stats' is NULL to fix this
> typo error.
> 
> Fixes: 201ed315f967 ("net/ethtool/ioctl: split ethtool_get_phy_stats into
> multiple helpers")
> Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
> ---
>  net/ethtool/ioctl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index
> 5a55270aa86e..e645d751a5e8 100644
> --- a/net/ethtool/ioctl.c
> +++ b/net/ethtool/ioctl.c
> @@ -2220,7 +2220,7 @@ static int ethtool_get_phy_stats_ethtool(struct
> net_device *dev,
>  	const struct ethtool_ops *ops = dev->ethtool_ops;
>  	int n_stats, ret;
> 
> -	if (!ops || !ops->get_sset_count || ops->get_ethtool_phy_stats)
> +	if (!ops || !ops->get_sset_count || !ops->get_ethtool_phy_stats)
>  		return -EOPNOTSUPP;
> 
>  	n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
> --
> 2.30.2
> 
Good catch!!

Reviewed-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>