[PATCH v2] common/mlx5: fix the sysfs port name translation

[Stephen Hemminger]

On Wed, 22 Mar 2023 13:34:12 +0200
Bing Zhao <bingz at nvidia.com> wrote:

> +
> +		port_name = (char *)malloc(IF_NAMESIZE);
> +		if (port_name == NULL) {
> +			fclose(file);
> +			rte_errno = ENOMEM;
> +			return -rte_errno;
> +		}
> +		line_size = getline(&port_name, &port_name_size, file);

This code is doing unnecessary extra work here.
From getline() man page:

     If *lineptr is set to NULL before the call, then getline() will
       allocate a buffer for storing the line.  This buffer should be
       freed by the user program even if getline() failed.