relay: use strscpy() is more robust and safer

The implementation of strscpy() is more robust and safer.  That's now the
recommended way to copy NUL terminated strings.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Xu Panda <[email protected]>
Signed-off-by: Yang Yang <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: wuchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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