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netfilter: xtables: refactor deprecated strncpy
Prefer `strscpy_pad` as it's a more robust interface whilst maintaing
zero-padding behavior.
There may have existed a bug here due to both `tbl->repl.name` and
`info->name` having a size of 32 as defined below:
| #define XT_TABLE_MAXNAMELEN 32
This may lead to buffer overreads in some situations -- `strscpy` solves
this by guaranteeing NUL-termination of the dest buffer.
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>