btrfs: Use memset_startat() to clear end of struct

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_startat() so memset() doesn't get confused about writing
beyond the destination member that is intended to be the starting point
of zeroing through the end of the struct.

Cc: Chris Mason <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: David Sterba <[email protected]>
Cc: [email protected]
Reviewed-by: Nikolay Borisov <[email protected]>
Acked-by: David Sterba <[email protected]>
Signed-off-by: Kees Cook <[email protected]>

0 files changed, 0 insertions, 0 deletions