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

Add struct_group() to mark region of struct kone_mouse_event that should
be initialized to zero.

Cc: Stefan Achatz <erazor_de@users.sourceforge.net>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Acked-by: Jiri Kosina <jikos@kernel.org>
Link: https://lore.kernel.org/lkml/nycvar.YFH.7.76.2108201810560.15313@cbobk.fhfr.pm

Signed-off-by: Kees Cook <keescook@chromium.org>